Uninstall MongoDB on Mac OS X

When I try to run mongod from the terminal, I get the following error:

2014-07-02T23:56:24.797-0700 [initandlisten] ERROR: listen(): bind() failed errno:48 Address already in use for socket: 0.0.0.0:27017 2014-07-02T23:56:24.797-0700 [initandlisten] ERROR: address already in use

I recently realize that I have two versions of MongoDB on my Mac, and think this may be the source for the above error. (Plus, I do not need two versions.) I tried Googling but was not able to find clear directions on how I can uninstall. I have development version 2.7.0 AND 2.6.3.

Thanks so much in advance for the help!