Things You'll Need
Instructions
How to Connect an Xbox to a Router Using an Ethernet Cable After Using WiFi
Plug one end of the Ethernet cable into your modem and plug the other end into the Internet, WAN or WLAN port on the back of your router.
Plug your router into an electrical outlet. The Internet, WAN or WLAN light on your router should light up once it is successfully connected to your modem.
Plug your computer network cable into your router.
Turn off your Xbox if it is on.
Plug in one end of a Ethernet cable into your router and the other end of the Ethernet cable into the network port on the back of your Xbox. You can now restart your Xbox and, following the prompts on the screen, create an Xbox Live account.