Tracy gave you the link to the usergroups, and you probably saw you have to be here for a bit longer and have a few more posts before you can have a custom avatar.
As far as a signature, you need to put [img] tags around the link in your sig. The picture you have there is *almost* legal for TCS
. The dimensions are fine, but the file size is a bit too large. It needs to be no larger than 30K. I am not awake enough to have my Photoshop open yet :lol3, but when I do later, I can resize it for you, if no one has beaten me to it yet
I'll move this to the signature Forum for you.