[HELP] How do i make Transperant Backgrounds.

Ok, How do i make a transparent background using photoshop Cs2.
Look at my sig, OKay.. i wont to make the back ground tranparent and just the red text but i dont know how.

wen i got to photoshop and i make a new canvas i make the background transparent and then the background goes to gray and dark gray boxes then wen i save it the background becomes white. Liek on my signature and my avatar.

Ill thank any1 who helps me.

And on my signature im giving free thanks to any who posts on that thread.

Read the pm i told u.

Please post here Ape in the future so i know what topics to close.