you create the MySQL in your cpanel (hosts panel for you) then place the details:
DB Name: that u created.
DB Pass: that u created.
DBUser: that u created.
into config.php(inside the /includes folder)
once all uploaded, go to your-site.xxx/install/install.php and follow the instructions.
if your vbulletin is loaded into your-site.xxx/forum then it will be your-site.xxx/forum/install/install.php to get it started....
the installation folder should just be /install/ not sure why u have 11 after it?.