Instructions
Make sure your modem and wireless router are active.
Turn on your Wii. With the Wiimote, press the "A" button to bypass the standard safety warning.
Click on the "Wii" button In the Wii's Main menu. This is located in the lower left corner of the menu.
Click on "Wii Settings" when you reach the next menu.
Click the blue arrow on the right side of the screen. On the new screen, click the "Internet" button.
Select "Connection Settings." Then, select one of the three open connections available.
Select the "Wireless Connection" button at the next menu.
Select "Search for an access point." The Wii will then begin searching for the signal coming from your wireless router.
Select your access point when a list of available points appear. Click "Save," then click "OK" to save your connection settings.
Select "OK" again to start a connection test.
Perform any system updates that are necessary after the connection test is successful.
Review and accept the online user agreements. Doing so will enable your Wii to play games online.