how do you put the cool letters and crap in the digs and change them arouind and stuff? sry im new to this

Im new too but there is a tool in photoshop. In the side bar full of tools that inserts text. I just figured that out now.

This thread was dead for a while, but I spose if you all need a tut I'll make one.

Do all of your brushing first, then click the text button
http://img458.imageshack.us/img458/3356/step1showingbutton6la.jpg

Type in the text, and choose your font, size, and anti-alias (should you want one, which most people do).
http://img458.imageshack.us/img458/7711/step2topbar5ti.jpg

right-click on the layer of the text, and select blending options.
http://img458.imageshack.us/img458/8552/step3blendclick9xh.jpg

Select how you want to effect the text, I went with a basic 1-2 pixel stroke.
http://img499.imageshack.us/img499/2655/step4blendoptions3oh.jpg

Then finish the sig as you would normally.

This was my final result, I defintly could've done this to a better sig, but I did it quick, so go easy.
http://img458.imageshack.us/img458/9656/nighthawksig4yk.jpg