Acer Chromebook Spin 513, Chromebook Enterprise Spin 513 Manual

GETTING STARTED

Turn on your Chromebook
On the Chromebook, press the power button. A "Welcome" screen will appear when the Chromebook first boots up.

Select your language settings
Use the "Language" drop-down list to choose your default language setting. If there is more than one way to type in your language, you may be prompted to select a keyboard input method as well.

Connect to a network
Select a network from the "Connect to network" list to connect to the Internet. If network access is protected, you will need an access password to connect to it.

Accept the Terms of Service
Once connected to a network, accept the Terms of Service. Your Chromebook will then download any available system updates, so you automatically get the latest Chrome OS features.

First-time sign-in
Create a new Google Account
You can create a new Google Account if you don't already have one. Select Create a Google Account to set up a new account. A Google Account gives you access to useful web services developed by Google, such as Gmail, Google Drive, and Google Calendar.

Browse as a guest
You can also use the Chromebook without a Google Account by selecting Browse as a Guest.

Enterprise enrollment (optional)
You can enroll the Chromebook by selecting Enterprise enrollment.

Sign in to your Google Account
If you already have a Google Account, enter your username and password in the sign-in box that appears and select the Sign in button. If your device is a Chromebook Enterprise, click More options and select Enterprise enrollment.


Sign in with your primary Google Account. This account will be set as the owner and is the only account that will be able to change certain Chrome settings.

YOUR ACER CHROMEBOOK TOUR

Front view

Keyboard view

Function keys
The computer uses function keys or key combinations to access some hardware and software controls, such as screen brightness and volume. The dedicated function keys each have a specific function.

Icon	Function	Description
	Previous	Go to the previous page.
	Next	Go to the next page.
	Reload	Reload the current page.
	Full-screen	Open the page in full-screen mode.
	Next window	Switch to the next window.
	Brightness down	Decreases the screen brightness.
	Brightness up	Increases the screen brightness.
	Mute	Turns off audio output.
	Volume down	Decreases the volume.
	Volume up	Increases the volume.
	Lock screen	Locks the screen.
	Search	Search from the Apps panel.

Common keyboard shortcuts
You can use shortcuts to complete some tasks more quickly.

Keyboard shortcuts	Description
Ctrl +	Takes screenshot.
Alt +	Toggles caps lock.
Alt +	Projects your screen.
Alt +	Brightens the keyboard backlight.
Alt +	Dims or brightens the keyboard backlight.

Note: For a complete list of keyboard shortcuts, press Ctrl + Alt + /

Touchpad
The built-in touchpad is a pointing device that senses movement on its surface. This means the cursor responds as you move your fingers across the surface of the touchpad.

Left view

# Icon	Item	Description
1	USB Type-C port with DC-in	Connects to the provided USB Type-C power adapter and to USB devices with a USB Type-C connector. Supports DisplayPort ™ over USB-C ™.
2	USB port	Connects to USB devices. (Vary depending on models.) If a port is black it is USB 2.0 compatible, if it is blue it is also USB 3.2 compatible.
3	Headset/speaker jack	Connects to audio devices (e.g., speakers, headphones), or a headset with microphone.
4	SIM card slot (optional)	Accepts a Nano SIM card.

USB Type-C information

• USB 3.2 Gen 1 with transfer speeds up to 5 Gbps.
• Supports DisplayPort^™ audio/video output.
• Delivers up to 3 A at 5 V DC for USB charging.
• DC-in: requires power adapter or power source providing 45 W at 5~20 V.
  For optimal performance, please use a certified Acer power adapter or USB Power Delivery device.

Right view

#	Icon	Item	Description
1	+ / -	Volume control key	Adjusts the system volume.
2		Power button	Turns the computer on and off.
		Battery indicator	Indicates the computer's battery status. Charging: The light shows amber when the battery is charging. Fully charged: The light shows blue when in AC mode.
3		USB Type-C port with DC-in	Connects to the provided USB Type- C power adapter and to USB devices with a USB Type-C connector. Supports DisplayPort ™ over USB-C ™

Bottom view

USAGE MODES

Your computer features the following modes. You can choose a mode to fit your needs.

THE CHROME OS DESKTOP

Window controls

Number	Description
1	Goes Backward and Forward in the current web browsing sessions's history (closing and reopening the Chrome browser begins a new session). Select to Reload the current webpage.
2	Closes a tab.
3	Opens a new tab.
4	Type a web address or perform an internet search in this search box (also known as the "omnibox").
5	Minimizes the window into the desktop shelf.
6	Maximizes the window to take up the entire screen. Click again to return window to previous position. Also, select and hold to display a left and right arrow next to the icon. These neatly align the window to take up half the left side of the screen or the right side, respectively.
7	Closes the entire window (tabs and all).
8	Bookmark (save) webpage links to this quick-access area called the "bookmarks bar".
9	Select to bookmark (save) a link to the currrent webpage.
10	Select to use any enabled extensions you have installed in Chrome from this extension list.
11	Select to customize and control Google Chrome.

Shelf

Note
Specifications vary. Some icons may not be applicable to your Chromebook.

Launcher
Select the Launcher icon to display the launcher page. This is the fastest way to search for something. Simply start typing to search the internet, your bookmarks, any files you have stored in your Google Drive, and items in the Web Store.
The Launcher page is also the place to access all your apps. Below the search box are your frequently-used apps. Simply select one to open it. To see all apps you have installed, select .

Pinned apps
You can pin or unpin apps on the shelf.

To pin an app to the shelf

1. Select the Launcher icon.
2. Click to select All Apps (or type the name of the desired app).
3. Locate and two-finger tap the desired app icon.
4. Select Pin to shelf.
   To reorder the apps on the shelf, just drag them around.

To unpin an app from the shelf

1. Locate and two-finger tap the desired app icon from the shelf.
2. Select Unpin.

Status area
The Status area enables you to see vital computer information at a glance, such as the time, Wi-Fi signal strength, and battery life. Tap the Status area to display a box with more options.

Icon	Description	Icon	Description
	Notifications		Shut down
	Lock screen		Settings
	Volume control		Wireless network connection
	Bluetooth status		Battery status
	Night light		Keyboard
	Brightness control

APPS & EXTENSIONS

You can enhance your Chromebook with extra web applications (Chrome apps, for short), features for the browser (also known as extensions) and apps designed for Android™ (Play Store apps). Chrome apps work like regular software programs for desktop computers, except they run entirely on the web. Extensions provide custom features and functionality for the Chrome browser. Android apps, designed for Android mobile devices are supported on Chromebooks. You can find Chrome apps and extensions through the Chrome Web Store, and Android apps using the Google Play Store.

Managing apps
Note
Certain apps and browser extensions may not be available in all countries and regions. The contents and design of the Web Store may vary by region. Updates may add new categories or change how to navigate the Web Store at any time.

Installing apps from Chrome Web Store

1. Select theLauncher icon.
2. Click to select All Apps (or type "Web Store").
3. SelectWeb Store.
4. You can then browse through the app categories in the left column or search for a specific type of app using the search box.
5. When you find an app that you would like to add, select it and then selectAdd to Chrome.
6. A verification window will pop up, selectAdd to download and install the app, or select Cancel.
   To open your new app, select the Launcher, then All Apps (or type the name of your new app), and then select the app.

Installing apps from Google Play Store

1. Select the Launcher icon.
2. Click to select All Apps (or type "Play Store").
3. Select Play Store.
4. You can browse apps by category or search for an app by keyword.
5. Select an app to view more information.
6. Select INSTALL to download apps.
   Downloaded apps will be installed in the Launcher. If you cannot find the apps, select All Apps from the Launcher.

Removing apps from Chrome OS

1. Select the Launcher icon.
2. Click to select All Apps (or type the name of the desired app).
3. Two-finger tap on the app you want to remove. For more informationsee Touchpad.
4. Select Uninstall.

Note
Some apps such as the Chrome web browser cannot be uninstalled.

Google Drive
All files saved to your Google Drive are saved online and are accessible to other devices, such as your smartphone or tablet. Files saved to the Downloads folder are saved to your local drive and are only accessible to your Chromebook.
Note
You must be connected to the Internet to do the following Google Drive operations.

Difference between Drive and Files apps
Google Drive is a web-based storage service offered by Google, and the Files app is the onboard storage system for your Chromebook. Because your Chromebook makes heavy use of the web, you can easily access files both from Google Drive and those that are stored locally by using the Files app on your Chromebook. To use the Files app, select the Files icon in the apps list, or use the keyboard shortcut <Alt> + <Shift> + <M>.
This user manual uses Google Drive and Files interchangeably when giving instructions regarding accessing files.

Creating a new document

1. From the Apps list, select the Google Drive icon.
2. Select New and select the type of document you want to create.

Note
For an alternative method of creating documents, see How to create documents.

Sync files from Downloads to Google Drive

1. Select the Launcher icon.
2. Click to select All Apps (or type "Files").
3. Select the Files icon.
4. Select the files that you want to upload.
5. Drag-and-drop the files toMy Drive.

Enable offline access to Google Drive files
You can access files stored on your Google Drive while offline, but first you must enable offline access:

1. Select theLauncher icon.
2. Click to select All Apps (or type "Files").
3. Select theFiles icon and then select My Drive.
4. Select the file(s) you want to access offline.
5. Two-finger tap to bring up the context sensitive menu and selectAvailable offline. For more information see Touchpad.

Gmail
Composing an email

1. Select the Launcher icon.
2. Click to select All Apps (or type "Gmail").
3. Select the Gmail icon and then Compose.
4. Enter the recipient's email address, the subject, and the message.
5. When you are finished composing your message, select Send.

YouTube
YouTube is a video-sharing website on which users can upload, share and view videos. You can access it by doing the following:

1. Select the Launcher icon.
2. Click to select All Apps (or type "YouTube").
3. Select the YouTube icon.

Playing video or audio files
Your Chromebook has a built-in media player to play audio and video files. To play a file, double-click on an audio or video file in your Files app.

Other Supported File Types
Your Chromebook supports a number of other file formats.

CHROME OS TIPS AND TRICKS

Your Chromebook is a new type of computer that works somewhat differently than what you may be used to, so you might like to know how easy and useful things are when using it. Here are some tips and tricks.

Documents
How to create documents

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Google Docs", "Google Sheets", or "Google Slides" depending on the type of document you want to create) Create word processing files with Google Docs, spreadsheets with Google Sheets, and presentations with Google Slides.
3. SelectGoogle Docs , Google Sheets , or Google Slides .
   That's it. You've just created a new document in a few seconds. With your new document, you can add text, insert images, change the font, make it bold, underline it, italicize it – you get the gist. Most of the formatting and other stuff you might be familiar with from other productivity suites like Microsoft Office you can do with Google Docs.
   Note
   For an alternative method of creating documents, see Creating a new document.

Finding your documents
All documents you create are saved to your Google Drive where they are online and accessible to other devices, such as your smartphone or tablet. To find your documents, do the following:

1. Select the Launcher icon.
2. Click to select All Apps (or type "Google Drive").
3. Select the Google Drive icon.
4. Select My Drive (or whatever sub-folder you've created to put your files in).

Since your files are saved in Google Drive, they are saved online and available anywhere you have internet access. To access your files from any internet-connected computer do the following:

1. Open the computer's web browser.
2. In the browser's address bar, type "drive.google.com" (this is theGoogle Drive web address).
3. Login using your Google account username and password.
4. SelectMy Drive (or whatever folder you've created to put your files in).

How to share documents with other users

1. SelectShare in the upper right corner of your document.
2. Add people by typing in their email address. The sharing option works with your Gmail contacts, so as you type your email contacts appear for you to quickly select.
3. After you selectDone , they'll receive an email letting them know a document has been shared with them.

How to start a video chat
For all you Skype users out there, Google Hangouts are free video chats for up to ten people. To make a Hangouts video call, do the following:

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Hangouts").
3. Select theHangouts call icon.
4. Type in the name or email address of a person.
5. Select theInvite button to start your Hangouts.

How to listen to music

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Play Music").
3. SelectPlay Music .
   Note
   Play Music may not be available in all countries and regions. Google Play's current list of country availability for apps and digital content, visit https:// support.google.com/googleplay/answer/2843119?hl=en
   To listen to streaming music, you can download streaming apps like Pandora, Spotify, Rdio, Deezer and more (availability varies by country) from Chrome^™Web Store or Google Play Store .

How to watch videos, TV, or movies

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps and select one of the following options:
   1. SelectYouTube to view a vast amount of user-uploaded videos covering nearly everything imaginable.
   2. SelectPlay Movies to watch the movies and TV shows you love.
      Note
      Play Movies may not be available in all countries and regions. Google Play's current list of country availability for apps and digital content, visit https:// support.google.com/googleplay/answer/2843119?hl=en
   3. To find more entertainment apps like Netflix, Flixster, and more (availability varies by country), select Web Store or Play Store . Then, search for "Netflix" or other entertainment apps.

Working with Microsoft Office (Word, Excel, and Powerpoint) documents
Open and edit Microsoft Office files using Google's office compatibility mode

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Files").
3. Select the Files icon.
4. Double-click on any Microsoft Office file stored in Google Drive or on an external hard drive or USB flash drive connected to your Chromebook.
   Google Chrome automatically opens and enables limited editing of the document.

Convert Microsoft Office files to Google Drive formats

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Files").
3. Select theFiles icon.
4. Double-click on anyMicrosoft Office file stored in Google Drive or on an external hard drive or USB flash drive connected to your Chromebook.
5. SelectFile > Save as Google Docs, Slides, or Sheets (format depends on the type of document).

Export Google Drive documents as Microsoft Office files

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Docs").
3. Select Google Docs, Sheets, or Slides (depending on the document you want to create).
4. After creating the content of your document, selectFile > Download as and select the type of format you want to save as.
5. The file is saved to thedownload section of the Files app.

Opening Microsoft Office files using Microsoft's Office Online apps from the Chrome Web Store or Google Play Store
Another option for working with Microsoft Office files is to use Microsoft's own free web-based Office Online tools. You can download the Word Online, Excel Online, and PowerPoint Online apps from the Chrome Web Store or Google Play Store (you'll need to create a Microsoft account if you don't already have one). Then, you can login and create files or upload files you have already created and edit them.
Note
Office Online programs save files you create exclusively to Micrsoft's own OneDrive cloud storage. Though you can download a file you create and then move it to Google Drive or a removable storage device, you cannot save it directly to those locations. Also, to work on a file you've already created, you must first upload it to OneDrive by selecting Open from OneDrive from within whichever Office Online product you are using (you can install the OneDrive app from the Web Store as well).

How to use your Chromebook when there's no internet
The Chrome Web Store contains useful offline apps. For more information see Installing apps from Chrome Web Store. You're able to filter your app search by selecting the Runs Offline checkbox. For those times you don't have an internet connection, these apps help you stay productive and entertained. A few of the pre-installed options are described below.

Gmail Offline
Note
The first time you use Gmail Offline you MUST be connected to the internet to enable offline viewing.

1. Go to Gmail and select Settings > Settings.
2. Select Offline tab.
3. Select Enable offline mail.
4. Choose your settings, such as how many days of messages you want to sync.
5. Select Save Changes.
6. Use the app like you normally would. It'll update and send your emails the next time you log on to the internet.

Google Drive

Any changes you make to a current document or any document you create while offline are saved locally on your computer and will not be seen if you open the document from Google Drive on another computer or device. The changes will only be reflected in the Google Drive online version of the document the next time you connect to the internet and access Google Drive.

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Google Drive").
3. Select theGoogle Drive icon.
4. Open a Google document you have already created or create one as you normally would. For more informationsee Creating a new document. Notice the offline icon displays next to the file name reminding you that you are working on this document while not connected to the internet.
5. Make your desired changes. The next time you are online and have Google Drive open, your local changes will upload to Google Drive.

Note
If you make changes to a Google document while offline and someone else makes changes to the document as well (for example, if the document is shared with someone else), the next time you are online and have Google Drive open, your changes will merge with the other person's changes.
You can't open and access every type of file you have saved in Google Drive when there is no internet connection. To enable offline access to file types other than Google documents when offline, see Enable offline access to Google Drive files.

SETTINGS

Use the settings menu to adjust the various options for your Chromebook. To access the settings menu do the following:

1. Select the Status area of the shelf in the lower-right corner of the screen.
2. Select Settings icon.
   
3. To show the advanced settings, scroll to the bottom and select Advanced.
   Note
   Using default settings, the Chromebook will enter hibernate mode after one hour.

Changing the language settings

1. Select the Status area of the shelf in the lower-right corner of the screen.
2. Select Settings icon.
3. Select Advanced.
4. Scroll down and select Language in the Languages and input section.
5. Select Add languages to add additional languages.
6. To enable a language for keyboard input, underInput method select the checkbox next to your desired input method.
7. Select Add when finished.

Changing the clock settings
You can change the time format and time zone on your Chromebook. If the date or time is incorrect on your Chromebook, try adjusting the time zone.
To change the time zone:

1. Select theStatus area of the shelf in the lower-right corner of the screen.
2. SelectSettings icon.
3. SelectAdvanced.
4. In theDate and time section, select the desired time zone from the the drop down box.

Customizing appearance
Customizing the wallpaper

1. Select theStatus area of the shelf in the lower-right corner of the screen.
2. SelectSettings icon.
3. In thePersonalization section, select Wallpaper (or right-click your desktop and select Set wallpaper).
4. To pick your own wallpaper, select My Images. To pick Chrome wallpaper, you can browse through the categories in the left column and click an image.
   You can also choose Daily Refresh to set your wallpaper to cycle through random order daily.

Customizing the theme

1. Select Settings from the Chrome Browser.
2. In theAppearance section, select Browser themes.
3. You'll be taken to theChrome Web Store, where you can find extra resources for the Chrome browser.
4. Once you find a theme that you'd like to try out, select it and then selectAdd to Chrome.

Setting up mobile data connection
If your Chromebook has a SIM slot, you can connect to the internet using a cellular phone network. To do this, you must have a compatible SIM card and a data contract with your cellular provider. Place a SIM card seated properly in the tray and press the tray back to your computer firmly. You first need to insert the SIM card of the celular provider and enable it.
Before you can use mobile data network with your Chromebook, you need to activate your SIM card. You can follow the following procedure.
Note
Do not force the SIM card. If it does not fit, ensure you have the SIM card properly oriented. Trying to force the SIM card into the slot when it is incorrectly oriented may damage the SIM card and/or your Chromebook.

Insert the SIM card

1. Turn off your Chromebook.
2. Use the supplied tool to remove the card tray by pressing the tool into the release hole on the tray.
3. Place a SIM card seated properly in the tray and press the tray back to your computer firmly.

Note
The SIM ejection tool diagram is for reference only, actual product accessories may vary by specifications.

Enable mobile data

1. Turn on your Chromebook and sign in. If your system asks for a PIN, enter it. If you don't know the PIN contact your mobile provider.
2. Select the Status area of the shelf in the lower-right corner of the screen.
3. SelectSettings icon.
   • The network screen is displayed.
4. In theNetwork section, click Unlock Mobile data.
   • When the SIM card is enabled, enter the PIN number.
5. Enter PIN number and clickUnlock at the bottom right,
   Note
   If you enter the wrong PIN four times, the SIM card becomes blocked.
   Contact your mobile carrier to retrieve your PIN code.
6. The connection setting for mobile data (LTE) is complete.
   

Connect to mobile data
After you have activated the mobile data, you can connect to it.

1. Select the Status area of the shelf in the lower-right corner of the screen.
2. Select Settings icon.
3. Click on Network.
4. Turn on Mobile data.

Change your PIN number for your SIM card

1. Select the Settings icon.
2. Turn on Mobile data.
   
3. In the Enable SIM card locking (require PIN to use mobile data) field, click to enable CHANGE PIN. (Note: SIM card locking needs to be enabled in order to change SIM PIN.)
   
4. In theEnter old PIN field, type the current PIN.
   Note
   If you enter the wrong PIN four times, the SIM card becomes blocked. Contact your mobile carrier to retrieve your PIN code.
   
5. In theEnter new PIN field, type four to eight digits that you want to use for the new PIN.
6. In theRe-enter new PIN field, type the new PIN again.
7. ClickChange. The new PIN is applied to your SIM card.

Setting up a printer
You can use the Google Cloud Print service to send print requests to many types of traditional cabled printer and wireless "cloud ready" printers; however, not all printers are supported.
To learn more about Google Cloud Print and how to set up your printer, reference Google's own Chromebook Help to find comprehensive information on this topic. To access Chromebook Help, do the following:

1. Press theSearch key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Explore").
3. Select theExplore icon.
4. SelectHelp (or type "Printer" in the search box.)

Updating Chrome OS
Automatic update
Each time you turn on your Chromebook, it automatically checks for updates. When an update is available, this update icon will appear as a notification in the status area. To apply the update:

1. Select the Status area of the shelf in the lower-right corner of the screen.
2. Select Restart to Update.
3. Your Chromebook will shutdown and automatically restart, with the update applied.

Manual update
To manually check for an update or check what version of Chrome OS you are using:

1. Select the Status area of the shelf in the lower-right corner of the screen.
2. Select Settings icon.
3. Select About Chrome OS from settings at the top left corner.
4. In the dialog that opens, selectCheck for updates. If any updates are available, they will be displayed on the page.
   
   Do not modify your Chromebook's hardware yourself. Doing so will cause the update function to no longer work. Please get in touch with your dealer or an authorized service center. Visit www.acer.com to find an authorized service site.

Resetting your Chromebook
There may be times when you want to reset your Chromebook (for example, removing your personal information and settings). Completely resetting your Chromebook is known as "Powerwashing", which is basically factory resetting your computer. After powerwashing, your Chromebook will look like it did out of the box (including all apps that came pre-installed). To powerwash your Chromebook, do the following:

Powerwashing your Chromebook will remove all local settings, data, and programs from your hard drive. Backup any data on your hard drive that is not saved online by moving it to Google Drive and waiting for it to sync.

1. Select the Status area of the shelf in the lower-right corner of the screen.
2. Select Settings icon.
3. Select Advanced.
4. In theReset settings section, select Powerwash.
5. Select Restart.
6. In the box that appears, select Powerwash > Continue.

HELP

Online and offline help
Additional help is available both online and offline. Chromebook Help is installed on your Chromebook and doesn't require internet access. It covers basic troubleshooting as well as more detailed information about Chrome OS and using your Chromebook.

Note
Some sections in Chromebook Help have web links, which require you to have internet access to view the additional information.

To access Chromebook Help, do the following:

1. Press the Search key on your keyboard or select the Launcher icon.
2. Click to select All Apps (or type "Explore").
3. Select the Explore icon.

FREQUENTLY ASKED QUESTIONS

Question	Answer
What software works on a Chromebook?	Chromebooks use apps from the Google Play Store and on the web, instead of traditional software applications. There are apps to be productive, get creative, enjoy movies and shows, play games and more.
How do I get more apps?	Download Chromebook apps from the Google Play Store app . Find the app by clicking the Launcher icon and searching "Play Store".
Can I use Microsoft Office software?	Chromebooks work with Microsoft ® Word, Excel ® and PowerPoint ®. You can download the apps from the Google Play Store or use them on the web. *Additional functionality available with a Microsoft 365 subscription. Microsoft, Excel and PowerPoint are registered trademarks of Microsoft Corporation.
Where can I find my files?	All your files are stored in the Files app . Find the app by clicking the Launcher icon and searching "Files".
How do I transfer my local files?	Transfer your local files using a compatible storage device. Your Chromebook works with most external storage devices (e.g.: USB thumb drives, removable hard drives).
Why does my Chromebook need my Google Account information?	You'll use your Google Account to sign in to your Chromebook. It is the same account you use for Google services such as Gmail and Drive. Your Chromebook uses your account information to automatically sign you into apps and services.
How do I set this up for my child?	If you want to set up parental controls for your child, it's important that you sign in using your child's personal Google Account. If they don't already have one, you can create one during the sign-in process on your Chromebook. You will be able to add your child's school account after you complete device onboarding.

Get help or more information

For information on:	Refer to:
Chromebook Help	Open the Explore app on your Chromebook.
Chrome OS	https://support.google.com/chromebook/