Xbox 360: How to Connect to Wifi
If you have Wifi in your house and want to connect to it with your Xbox 360, here’s how.
Go to the Settings tab on the right and select System, then Network Settings.
Scroll to the right and select your wireless network.
If your network has a password (highly suggested) then type in your password on the screen.
It should bring up a network test, so let it run and press Continue when it finishes.