Access it whenever you are browsing the site by clicking "compare" under the name of the college.
This will bring you to the comparison tool with the name of the college you were viewing automatically taking one of the spots.
Type in a name of a college you would like to compare it to and find out who is the winner!
You can customize College Combat to make sure the colleges are being compared based on criteria that is important to you. Try adjusting some of the options to see how it changes the outcome.