So you lost your password for your new VBulletin Installation. so you can carry on working on your VBulletin board.
All you need is access to your MySQL database either from MySQL Admin
or if you have a working installation of PhpMyAdmin
and also that you have done some MySQL parts before.
Inset the following code in the database throut a query ( Make sure you BACK UP YOUR DATABASES FIRST!
Replace 'newpass' write the password you want.
userid = 1;;
You would need to be able to log in as admin.
See the official documentation https://www.vbulletin.com/docs/