Instructions
Insert the SD memory card containing the USB Loader GX program into your computer.
Move the theme file you would like to use onto the SD memory card into the "USB-loader/themes" folder. The theme should be placed in its own folder within the themes folder in order to load properly.
Remove the SD memory card from your computer. Open the front memory card cover on the Nintendo Wii console and insert the SD memory card into the console.
Load USB Loader GX from the Wii main menu. Press the "Settings" button and select "Theme menu." Select the new theme from the list and press "OK." The new theme will load.