Welcome Aboard Paul!
I think you'll need to upload your photos to a webhosting service first (ie photobucket) first, then post the link here.
Use the little button at the top of the message board you type in that looks like a picture. When you click on that, a new window will open that you can paste the link (use the 'direct link' from photobucket) in that box - your image will automatically load on the page when someone opens it.
(There are much better directions somewhere on the site, but I can't find them this morning!)