Instructions
Connect the wireless bridge to your wireless network. To do so, plug in its power adapter and connect it to a computer via an Ethernet cable. Log in to its configuration utility through the computer (consult its included documentation if you need to) and type in the password for your wireless network. Log out of the configuration utility once it is connected.
Move the wireless bridge to a location near your Xbox 360 console and plug in its power adapter. Use an Ethernet cable to connect one of its network ports to your Xbox 360's network port. Turn on the wireless bridge; it will reconnect to your wireless network automatically.
Turn on your Xbox 360 console and sign in with your gamertag. Press the center, circle button on your controller and select "Connect to Xbox LIVE" to connect to Xbox Live through the wireless bridge.