vBulletin programs are notorious for having less than user friendly photo albums. Honestly, I don't even try to use it anymore.
There are a couple of easy ways to post pictures.
One is to use a remote picture hosting service like Photobucket. Upload your picture to that site and coy a link of that picture into your post here. The problem with doing it that way occurs when you edit that picture on the remote server, it no longer works in your post.
The other and best way is to upload your picture directly from your computer to the post using the photo icon. Very small pictures can simply be copied and pasted into your post.
I'll find the post on posting pictures and put it
here after I find it.