On a Computer

1. Go to http://xfinityoncampus.com
2. Select your school from the drop-down list
3. Sign in using your university credentials
4. Choose "Watch Now" and it will take you to tv.xfinity.com

If you are having issues, alternatively, you can go directly to http://tv.xfinity.com and at the bottom select "XFINITY On Campus Students - Sign in here" and skip to step 2 & 3.