Please, help me!

In the Guide:
http://www.wiihacks.com/recommended-...d-any-wii.html

After install successfully the 30 wads, how to install the downgrade to 4.1?

I am in the Main Menu (the menu that have the WAD Manager).
First I remove the SD card, have been download the System Menu-4.1E-450 - Europe, I do a extract to the SD card and put it again in Wii.

But, when I go to the WAD Manager again, not appears the "System Menu-4.1x-xxx".

How to proceed to exit this MAIN MENU and launch again the HomeBrew Channel? Power off the wii?

Thanks!

(sorry my poor english)