Well, now that we've gotten that admission out of the way...You can post a pic in one of two ways.
You can link it from a site like photobucket using the link option. This is the 'world with the chain links in front of it' on the tool bar. It will prompt you to enter a url (
http://i21.photobucket.com/albums/b294/Tori_Allen/Vera_06.jpg)with which to link the picture.
The second way is just simply using the attachments links down below the new message. Under Additional Options click on the Manage Attachments link, then browse your computer for the correct picture.