How did u made this?

Well, it's kind of hard to explain, but it's kind of like making a skin on Minecraft, just way more complicated! In the game's files there are templates that show the models in the game unwrapped, and you color under them using the templates as guide lines. Just like how the player models in Minecraft are unwrapped, and you color over the template. Once your finished, the skin you made wraps over the model, thus texturing it.

Sorry if that was a really bad explaination, but here's the game creator's explaination tutorial on it, but it's probably not much better: http://www.feral-heart.com/index.php?option=com_content&view=article&id=9&Itemid=16