In order to allow your vBulletin members to switch between the installed forum front-end styles navigate to your vBulletin admin panel->Settings->Options->Style & Language Settings->Edit Settings.
Select the Yes radio button in the Allow Users To Change Styles area and save the modification. In this way when you log in your forum's front-end you will see the drop down menu in the bottom left corner and you will be able to change the styles through it.
You need help with an application? hostlantern is specialized in hosting and supporting more than 200 scripts. Sign up for our web hosting services and let us help you with your application, 24/7!