No problem Jim. The first thing you need to do is find a host site on the net for graphics. There are quite a few of them out there. After you have your pic hosted, right clip on the picture itself, select properties, and copy the entire url.
Then in your profile there is a space for your "signature". Put the url of the picture between these symbols [img ] and [\img ] please note that the spaces between the g and the ] are there for display purposes only.
If you have any problems, just shout, one of us "old veterans" will be able to help you get through it.
Happy Modelling and God Bless
Robert