I have never used it,& to be honest-I didn't know it exist.
1. Go to User CP
2. It will bad under "Networking"
3. Click on "Pictures & Albums"
4. Click on "Click here to add an album and start uploading pictures!"
5. If you have a Flickr, Photobucket, or something similar-Grab the HTML, or turn other choices(you can't use BB codes/links)
If that still doesn't work, Or you've tried that
Contact a Mod. or the Admin
And, I agree with Linds
I don't know anything about that, I've never even tried. But overall it's probably just way easier to upload them to another site such as Flickr or Photobucket or something similar and use those IMG links