I Have A Question.

With an usb cable connect the phone to the computer, and the phone will appear as one of the available storage devices on the computer. One of the phone files has the photos, you can remove them from there to the computer, and simply upload them to an image website, like imgur for example, and then use the "image" url option that exists when you make a post/thread; or you can directly upload to the forum's thread/post, under "upload a file option" on the thread/post. Although with a direct upload you can only add up to 8 images, while with the url method you can add as many images as you want.