I Need Some Help, Please.

Alright. So I installed that "neon tab" thing, and I even made a new folder in my phone to put all those things I got from the hacks and mods post. But, I don't want the neon thing anymore! I've tried to delete the file, but it won't let me. any ideas?

Also, once I do that, how do i install new "themes" on my TF3D? Like where do I store them, how do I get them to work, all that. Help is much appreciated. Thanks in advance!