yeah, what Jim said, I use imgur, it's free and you can keep you albums private while still using it to post pics.
Another way to easily find out how to post a pic, vid or link is to click on reply with quotes, of a post that has what you want to do, to see how it was done, then you can copy and paste it to your post for a visual reference. Then click on go advanced and preview post to make sure it worked so that you can easily edit before posting