XF 1.3 Adding & removing additional Top Navigation tabs?

Hey guys,

In the image below, you'll see the top navigation highlighted. I want to remove the tab that says 'FORUMS' and replace it with one that links to another website and in particular I want the phrase to say 'MMAFederation.com'. I want the header image and the 'HOME' navigation tab to act as the link back to the forum index page you see.

Is there any easy way to do this, via EXTRA.css or otherwise? I've tried to have a fiddle around a few templates (navigation and DEFIANCE.css *the style I'm using*) but I can't seem to crack how to edit these tabs and where they link to.

Thanks :)