BP Fun - Add Blog Categories to Navigation bar?

Hello all,

I am a new member to the community and have downloaded and installed BP Fun for use in a website I am currently developing. - http://www.tailgatingnation.com

I was wondering how I can list my blog categories on the main navigation bar. Right now only the pages are listed but ideally I want to have the categories along with a drop down menu on rollover listing their sub-categories. Is this possible and if so how can I accomplish this?

Thank you,