Instructions
Press the "A" button on the Wii Remote to select "Nintendo WFC" from the main screen.
Press the "A" button to select "Friend Code." Click "Confirm Friend Code" to view your own 10-digit Friend Code. Press the "A" button again to select "Register Friend Code" from the Friend Code Screen. Tap the 10-digit number Friend Code using the Wii remote
Press the "A" button to select "Nintendo WFC" from the main screen.
Press the "A" button to select "Nintendo WFC Match" and tap "Yes" to connect to Nintendo WFC.
Press the "A" button to select "Friends." The Nintendo Wii will search for other Wii Friends logged into the console and allow you to play against them.