Friends can only engage in multiplayer gaming on your Nintendo Wii if you invite them with your "FC number." FC stands for friend code. This numerical identifier makes it possible for the invited friend to connect his Wii directly to yours. The connection is not possible unless you give that other player permission and the code. The FC number can be found through the main menu system of the Wii.
Instructions
1
Select the "Wii" icon from the system menu. This will load a new menu.
2
Choose "Wii Message Board" and select the "Create Message" option.
3
Select the "Back" button. The Wii's FC number will be listed in the center of the screen.