To add a profile picture, go to the top of this page and hit the "Profile" button. On the left side of the window that opens, you will see a list of choices with a heading called, "Modify Profile." Select "Forum Profile Information." The first choice on the new page asks if you want to add a picture. For mine, I just chose a picture I liked at a website and put the pic's address in the "I have my own pic" box.
Hope to see your profile pic soon!