Turn on the printer and press the setup button. You will see the option of Wi-Fi setup in the menu for Canon TS3122 manual setup. Click on that. Keep clicking on the arrow beside Wi-Fi setup menu. You will see the option of manual setup. Press ok. You will see a list of Wi-Fi networks available. Select the name of your network. Click ok. Now, you would require to enter your password. A connection should establish and then click on ok to complete the process.