Things You'll Need
Instructions
Power off your Wii and connect the LAN or WiFi adapter to the back of the console with the attached USB cable.
Connect the LAN adapter to your broadband modem or router with the Ethernet cable. Skip this step if you are using a WiFi adapter with a wireless router.
Power on your Wii and click "Wii Options" at the bottom of the main menu. Then click on "Wii Settings."
Scroll to the second page of options. Click on "Internet" and choose "Connection Settings." Choose "Wired Connection" and click "OK" if you are using the LAN adapter. Choose "Wireless Connection" and click "OK" if you are using the WiFi adapter.
Wait for the system to validate the connection. Follow the prompt to download a software update if it appears.