Posting a photo is not too difficult. First, save the photo as a .jpg file no larger than 800 pixels X 600 pixels. Then come here and click on "post reply" in the thread. Scroll down below the message box section to the "Attach Files" section and click on "manage attachments". A window will open and you can browse to find the the file and upload it. Then post your message.
Another option is to host the photo on another site and then post a link to in your message, as I did here: