It's basically the same as using Gecko OS.
1. Plug the gecko into memslot 2 and get your PC ready.
2. Load (USB Loader GX or NEOGamma) - Tip: USB Loader GX is quicker for loading games, but Neo Gamma offers more hooks.
3. (If Using GX) Just start the game of choice, and it will load the default hook. (You cannot change this)
3. (If using Neo gamma) Choose your hook, Turn Debugger on and launch game.
Good luck!