I installed the cmps to www.website.com/portal.php

my forum is located at www.website.com

How can I make a link so that if a user chooses to use the portal, then they will always be directed to the portal when they click the homepage on the navbar, and in all places around the site?

Secondly, and this may get advanced... with my current setup..... lets say a member clicks the portal button, how do I set it up so that if they go to www.website.com, it redirects them to www.website.com/portal?

Thank you