Step 3: Install USB Loader Application on Your Wii Homebrew Channel.
This next step will explain how to usb loader on your Wii.
Before you can install usb loader to your Wii you first need the files in your SD card.
Unrar the usb hack rar file with Winrar or 7-Zip and copy the contents of the "Copy contents to root" folder to the root of your SD card. Pretty self explanatory. If you get a window asking you to merge folders click yes. Now comes the tricky part.
(Optional: You can also download the covers for the games.
The reason I say it's optional is because it contains over 1300 game covers and will occupy 100 MB in your SD card. But it's convenient to have so you don't have to squint to read the game text on the tv. Just download it, uncompress the Covers zip file with 7-ZIP and drag the covers folder to the usb-loader folder in the root on your SD card.. You will get a prompt to merge folders and click yes )
Remove any Gamecube memory cars and Gamecube controllers from the Wii.
Insert the SD card into your Wii, turn the Wii on and go to the Homebrew channel.
Click on "cIOS36rev10" and click load. The screen will go black for a second and you will then be in the cIOS36rev10 installer. Use the directional arrows to choose WAD installation and click A. After a few minutes it will have completed the installation of cIOS rev 10.
Now, restart your wii, go back to the Homebrew channel, and go to Wad Manager 1.3 and click load.
Choose the SD card, press A, then choose the WAD "USBLoadermodBrisma.wad" and press the + button on your Wii remote. After a few moments it will have completed installing the USB channel.
Press "HOME" on your Wii remote to restart your Wii.