Make a photobucket account! =) It’s the easiest, I think. You can even resize your pics on there and stuff.
Also, once you get them the way you want them, all you have to do is click once in the “IMG Code” field below the picture you want (when looking at your album) and it instantly copies the code you need to put up on the forum to your clipboard. So, once you get back to your post on the forum, just hit CTRL+V ! =)