I second what Yaraell_Ren said, at least, according to my preference. I've found Imgur to be the easiest way to upload photos without making whatever post I'm working on picture-heavy. Imgur will even provide you the necessary IMG tags to create a small image for the thread, that links to the larger image on Imgur.
When I posted my first build on all 3 of the different forums, I tried multiple different solutions. Imgur was hands-down the easiest and the only way I'll go in the future.