Instructions
Select the "Mii Channel" from the main menu of your Nintendo Wii. Select "Start."
Select "Wii Friend" on the right side of the screen.
Press and hold "A" on the Mii you wish to transfer.
Drag the Mii to the icon of the envelope at the top of the screen.
Select the friend to whose console you wish to transfer the Mii.
Select "Yes."
Click "OK." A copy of that Mii has been transferred to your friend's console.