Dean -
Thanks to our friends at Apple, all images on an iPhone or iPad are called image.jpg.. Hence, the direct upload to the forum will only allow you to upload a single picture from an iDevice directly.
My advise would be to open up a Photobucket or Flicker account (there are others), upload the pics from your phone to that account - then you can link to the pictures from the body of your message on the thread by using the [ IMG ] image-URL [ / IMG ] method.. Or you can upload to the forum message from that picture hosting service..