The only thing you need to do with the photo is make sure it isn't larger than 500 pixels, either height or width. Your photo software should have a "resize option".
When you've got your photo ready, in the main reply box, go to "attach files" and press the "manage attachements" button which brings up a new window. Click Browse and find the file on your hard drive. Click on it so the file extension shows up in the box and then press "upload". Then close the window and press "submit reply". Give me a shout anytime if you need any more help or need me to upload photos for you
Jx