The info on adding an image is in the FAQ section, upper right:
"Can I post images?
Yes, images can be shown in your posts. If the administrator has allowed attachments, you may be able to upload the image to the board. Otherwise, you must link to an image stored on a publicly accessible web server, e.g. http://www.example.com/my-picture.gif
. You cannot link to pictures stored on your own PC (unless it is a publicly accessible server) nor images stored behind authentication mechanisms, e.g. hotmail or yahoo mailboxes, password protected sites, etc. To display the image use the BBCode [img] tag."
Upload the picture to Flickr or Photobucket (both of these are free). The get the html code. Hit the "Img" close listed along the top of this message and put the html in the middle of the "img".
Or, you maybe able to attach it by using the "upload attachment" below this message. You can check to see if you have done it right by hitting the "preview" button, before you hit the submit.