[Graphic Design] I need help!! ...please?

I'm new to the arts and writing forum, but I figured if anyone can help me it's the people here, so here I go!

I still haven't figured out how to put a picture for my sig, after, what, two years of coming to this site just for the forums. I've tried asking others, but they haven't been much help seeing as I am not exactly a genius when it comes to the internet, and I have no idea what the freak vb and img codes are.

But anyways, I was wondering if anyone here could explain to a complete idiot how to add a picture for a sig, and also if anyone knows any good sites with sigs.
(I also would need help using one of my own pictures for my avatar, if anyone could help me there.)

Thanx everyone!

~~Kira (aka selphie666)