To set up Wi-Fi on your HP OfficeJet 5255 printer, follow these steps:

1. **Power on the printer.**
2. On the printer’s touch screen, press the arrow key on the right side to access the menu, then tap **Setup**.
3. Select **Network Setup**.
4. Choose **Wi-Fi Protected Setup Wizard** or **Wireless Setup Wizard**.
5. From the displayed list, select your Wi-Fi network name (SSID).
6. Enter your network’s security key or password (WEP/WPA), then tap **Done**.
7. Confirm by pressing **OK** to save the settings.
8. Optionally, print a wireless report when prompted to verify the connection.

If you encounter connectivity issues, consider restoring the printer’s network settings to default and then repeat the wireless setup. To do this:

– From the Home screen, touch **Wireless**, then **Settings**.
– Select **Restore Network Settings** and follow on-screen instructions.
– Print a network configuration page to confirm reset.
– Run the wireless setup wizard again to reconnect to your network.

A root-level uninstall and reinstall of the printer drivers on your computer may also help resolve persistent connection problems[1][2][3][4].