As it was my idea for the thread I'll try to help
I you need a picture stored on the web somewhere that can be accessed by either adding a picture link or a clickable link to your message. A number of things stop it working, this includes posting a link to a password protected site - i did this and it means that your computer will display the message showing the picture but anybody else accessing it will just get the red cross of doom. Try a full refresh of the page to see if its worked, you can always edit afterwards.
Hope this helped
Luke