Instructions
Press the "Power" button on the front of your Wii console. Select the "Wii" icon at the bottom of the screen. Select "Wii Settings" from the options on the screen.
Click the blue arrow on the right side of the screen to go to page two of the Wii Settings. Select "WiiConnect24" from the list of options.
Select "On" to enable WiiConnect24 and allow the system to update automatically whenever Nintendo has a new update available. Select the "Confirm" button at the bottom of the screen. Select the "Back" button to return to the previous menu. If there are any updates, your Wii will begin the update process automatically.