Boredem slaves me?, i want to change the r4 III skins

well on the official site it says you can, but how? is my question ^^, i hate virtual nature, and i want blood, BLOOD, themes can i edit the themes or make my own.or a site full of them?and guess what! im a handheld GAMER NOW!! WOOHOOnvm i found out about gbatemps download section DELETE THIS STUPID POST!!!! DIE DIE!!!

There's my tutorial.