Instructions
Push the "Power" button on the front of your Wii console to move to the next option on the BootMii menu. Do not worry; this does not turn off your Wii. You can also use the right arrow on the directional pad of a GameCube controller if you have one connected.
Go back to a previous option with the "Eject" button on the front of your Wii console, or the left arrow on the GameCube's directional pad.
Select an option by pressing the "Reset" button on the front of the Wii, or with the "A" button on the GameCube controller.
Exit BootMii by either selecting the appropriate option, or performing a hard restart of your Wii console by holding down the "Power" button for at least 5 seconds.