Please go to
http://www.vbulletin.com/members/forums.php and enter your email adress there. That will allow you to post your question in the proper forum and you will be marked as a licensed user.
You will need to use the login details you got when you purchased vbulletin to get to that page. If you never puchrased anything, and therefore don't own a license for vbulletin I fail to see any slight reason why you would need to know how to administer a vbulletin board.
Have a nice day.