After you have found your game cheat file and clicked GCT you will see a text box with all the codes listed. Click “add codes.” This brings up the list of codes with checkboxes next to each one. Click the codes you want, editing them if necessary.
If you have found any codes elsewhere, you can click on “add more codes” and enter them into the text box, then click “add codes.”
Once you have selected your codes, click “download GCT.” Save your GCT file to the “/codes/” folder on the SD card you use for Wii homebrew, creating the folder if it doesn’t already exist.
Now it's time to launch your game.