I want to put a wallpaper from my computer onto my Touch to use as the main (NOT the slide to unlock) background under the icons. Where do I put this? I see people say stuff like " put it under /private/var/root/Library/SummerBoard/Themes" But I have no clue how to even get there. Do I need to download a program to get there? And how do I make it so only the wallpaper changes, not the icons and stuff?