[TECK]

STEP 6
Open vBulletin Admin Control Panel and set your {imagesfolder} replacement variable to your full website URL, like that:
Replacements > Modify > [expand list] > {imagesfolder} > [change original]

and change the Code to insert to the full URL, instead of your current value, images.
Example: http://www.yoursite.com/forum/images

you didnt read careflully the readmefirst file:

http://www.massmonsterz.com/forums/images