Well theres several different ways. When you go to post, theres a "manage attachment" button below the "submit" button to post what youve written. This will allow you to browse on your pc for the photo. OR You can get an account at a website like www.photobucket.com and then use the IMG link it gives you and post that link into a post.
You're fucken retarded dude. j/k man! I had to learn too. you can also use http://imageshack.us And if you wanna use a pic that you found somewhere, all you have to do is tag it with IMG tags, like