Tim, when you are on your photos on Photobucket, right click on the photo. Left click on "properties". Copy and paste the address (URL). It'll be
http://a bunch of stuff and end with .jpg Then paste that URL on here. put [img] before it and [/img] after it.
[img] URL of the photo from properties [/img], but with no spaces between the [img] and the URL
It should work.
