How do I set up my ET-3850U to connect to a wireless network?
Press the home button, select the network icon and press OK, then select Wi-Fi (Recommended). Choose Wi-Fi Setup Wizard, select your network name from the list or enter it manually, enter your password using the on-screen keypad, and confirm the settings to save them. The Wi-Fi icon on the LCD screen will indicate your wireless connection status.
From the official Epson EcoTank ET-3850U All-in-One Wireless Printer manual, page 36
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