Instructions
How to Add a Wii Friend Code
Begin at the Wii Main Menu. With the Wiimote, select "Messages" in the bottom right-hand corner.
Point the Wiimote and select the option "Create a Message."
Click on "Register" in the bottom right-hand corner to register a new friend.
Select "Wii" and enter the 16-digit Wii number that corresponds with the friend, also known as the Wii friend code.
Enter a nickname to go with the Wii friend code and return to the Wii main menu.
How to Enter Multiplayer Mode
Begin at the main menu in any "Call of Duty" game.
Point the Wiimote and choose the option labeled "Multiplayer."
Choose the network "Nintendo Wi-fi" if the option is available. This option may not be available in some versions of "Call of Duty."
Select "Find Match."
Click on "Player Match List" if the option is available. This option may not be available on all versions of "Call of Duty." There may also be an option to "Join Match." This is the stage at which you join a multiplayer map with friends. Enter live game play on a team or as an opponent of a friend.