Instructions
Press the "Power" button on the front of the Wii. After the "Wii Channel Menu" appears, select the "Wii" icon on the bottom of the screen.
Select "Wii Settings" to open the "Wii System Settings" menu. Select the arrow on the right side of the screen to open the second page.
Select the "Internet" button. Select the "Connection 1: None" button. Select the "Wireless Connection" button.
Select the "Search for an Access Point" button and select "OK." Select the name of your wireless network. If required, use the onscreen keyboard to enter the password for the network.
Select the "OK" button. Select the "Save Settings" button. Select the "Yes" button to begin running a connection test. The Wii will use these settings automatically when connecting to the wireless network in the future.