chitown hitmen

On AIM.

I am a new member to paint.net and I have no idea on how to make a sig. I would like to make baseball sigs, but don't know how to get a picture onto a background, and then be able to get the sig onto like a forum for others to view. Help would be much appreciated. Or if someone could IM me at CIAcrackSELLER to give mesort of like a walk through, that would be good also.