Thanks Reg

Since this forum is still in beta testing I thought I would reply to mention that images can be inserted in to a message.
Instead of just entering the web address of an image as you did you could have clicked on the "Insert Image" icon in the message editor, then choose "From URL" and enter the URL of the image just like you did in the message you posted.

Doing so should result in something like this with a clickable image in your message;

IMG_0004.jpg

Hmmm, even though my reply got posted I did get a "database error" when I clicked to send the reply. That gives me something to look in to.