Instructions
Select "Mii Channel" from your Wii's main menu and then select "Start."
Place the cursor over the Mii you want to select.
Press and hold the "A" and "B" buttons on your Wii Remote simultaneously.
Drag the Mii to the "Edit Mii" icon on the left side of the screen.
Select the "Edit Mii" icon. This is the first icon on the icon bar at the top of the screen.
Select "Off" under the Mingle section.
Select "Mingle" to connect your Mii to the Internet. This Mii now shows up in your friends' Mii Parades, making it possible for them to view and use your Mii.
Repeat Steps 1 through 7 for any additional Miis from your Mii Channel you want to connect to the Internet.