Instructions
Connect your Nintendo Wii to the Internet, if you have not already done so. Turn on the Wii, and then press "A" on the controller. Select the "Wii" icon on the main menu. Click "Wii Settings," scroll to the second page of the menu, and choose "Internet."
Select a blank Connection Slot, and then click "Wireless Connection" and "Search for an Access Point." Click "OK." Select your wireless network from the list that appears. If prompted for an access code, enter your wireless router's security key in the box. Click "OK" followed by "Save Settings" and "Yes." A connection test is performed to confirm that the Wii is now online.
Return to the main menu, and click the "Wii Shop Channel" button. Choose "Start Shopping" and "Wii Channels." Click the "Internet Channel" button, and then select "Download." Click "Wii System Memory" followed by "OK" and "Yes." The Internet Channel is downloaded to the console.
Go back to the main menu. Click the "Internet Channel" button, and then "Start." You may now browse the Internet on the Wii.