From The LNR Book of Knowledge
Wii
Adding friends to your Nintendo Wii Console is very simple and will allow you to enjoy playing your favorite Wii games with your friends. This page is to give instructions on how to find your own Wii Console address, and how to add friends to your adress.
to find your address:
1: Power on your Nintendo Wii Console
2: From the Wii menu view the Wii Message Board (icon looks like an envelope on the low left of the Wii menu)
3: Select "create a message" (icon looks like a sheet of paper on the lower left)
4: Select the address book.
• A page will appear that says “this console’s Wii Number”
• You will give the Wii number to your friends so that they may add you to their address book
to add friends:
1: power on your Nintendo Wii Console
2: From the Wii menu view the Wii Message Board (icon looks like an envelope on the low left of the Wii menu)
3: Select create a message (icon looks like a sheet of paper on the lower left)
4: Select the address book
5: Use the arrow to turn the page
6: Select an address box, and choose to add Wii
7: Use your friend’s Wii number when prompted to add them
3DS
On the touch screen click the friends icon on the menu bar at the top. Its a smiley face. Scroll left and right to view your friends and to find your Friend Code. To add a new friend, click Register Friend. If your new friend is physically close to you you can select Local to add them. If not select Internet and enter their Friend Code.