To connect a Ricoh MP 402SPF to a computer, follow these steps:

1. Network Connection (Using Ethernet)
- Insert one end of the Ethernet cable into the printer’s Ethernet port.
- Insert the other end into the computer or network router.
- Plug the power cord into a wall socket and turn on the printer.
- Wait for the printer to recognize the network connection (this may take up to a minute).

2. Driver Installation (Using a CD-ROM)
- Insert the provided CD-ROM into the computer’s CD drive.
- Open File Explorer and double-click the CD-ROM drive.
- Run "Setup.exe" to start the installation process.
- Follow the on-screen instructions to install the printer driver.

3. Network Quick Install (For Network Setup)
- Open the installer and click [Network Quick Install].
- Accept the software license agreement and click [Next].
- Select the machine model (Ricoh MP 402SPF) from the list.
- Click [Install] to complete the setup.

4. Confirm Computer Information (If Needed for Scanning or Network Setup)
- Open Command Prompt and type `ipconfig/all` to find the computer’s name and IP address.
- Type `set user` to confirm the user name.

After completing these steps, the Ricoh MP 402SPF should be connected and ready for use.