How to fix broken tab in navigation bar

I have a tab in my navigation tab at the top of the page that does not work. I created a page I want that tab to take users to. How do I make the tab take users to the desired page.
website is https://www.rootedsystem.com
The tab that is broke is forum
I created the page that you can see at https://rootedsystem.com/forum
I just need to know how to get tab to take me to page.

Thanks