Mwc,
I met one of the forum users at headquarters this week (Mr. Kane), and he suggested that we put more instructions for this on the forum. I'll start a sticky topic on it as soon as I can, complete with screen shots.
Look at the post you already made. Immediately below it, you will see options like "Reply, Edit, Delete, Attach, ToDo, Report." You will only see these options for your own posts, and only if you are logged onto the forum.
Click on "Attach" and you will see how you can attach an image (gif, jpg or png) to the existing post from your own computer. It's easy!
Ross
AWS Marketing