vB3 How do I make my.............
 

How do I make my forum point into a different file other than index.php?

I made a landing page located here and I want to make that my home page. However in order to do that I would have to rename it to index.php

My question is how can I make the vbulletin index.php file into another name for example forum.php and have the same functionality I have now with the forum without having to movo files from the folders.

Thank you much.