Blix: create a new page but make it a link?

I noticed in blix template, if I create a new page, a new tab would automtically be added to the top navigation bar. Which is nice. But in the future I might want to add a forum to my site. What I like to do, is to add that extra tab (like creating a new page) but instead of going to a wordpress page, I want to link to the forum when the tab is clicked… any thoughts on what might be the easiest way to do it?