Brian, if you're talking about the automatic signature picture (like the one below), insert the following into the signature section of your profile:
[ url=http: //www.fly-euroharmony.com][ img ]http: //fly-euroharmony.com/pilots/automatic_image/2078.jpeg[/img][/url]
Remove all the additional spaces that stop the forum from interpreting that line. And for the automatic avatar picture (to the left), the URL you need is:
http://fly-euroharmony.com/pilots/badge/2078.png
(but you avatar may not appear straight away...)