Using Acer Theft Shield; General - Acer Aspire S5-391 User Manual

Note: If your phone does not have a barcode reader installed, you will
need to download one before you can scan the QR code.
Once you have downloaded the Android app to your phone, click Next to
start setting up Acer Theft Shield. Click Start to turn on your notebook's
Wi-Fi hotspot feature, this will allow your phone to detect the notebook.

Using Acer Theft Shield

General

Once you have selected the method to use, you will be shown the
General page which allows you to activate Acer Theft Shield and select a
hotkey combination to activate Acer Theft Shield.
66 - Acer Theft Shield