Saddy here, posting as a test user to identify the problem and test.
You can enter the url for your image as BBCode: If you first select the [b]’disable rich text'[/b] option (just below your edit window) and type the following:
[b][img]http[/b][b]://w[/b][b]ww.sadgeezer.com/Legacy/images/SadCAST-KDDthumb.jpg[/img][/b]
should display
[img]http://www.sadgeezer.com/Legacy/images/SadCAST-KDDthumb.jpg[/img]
There is currently no facility to upload images to this server because of the security vulnerability. I intend to find a way around this soon.