How do I setup Comcast XR2 remote for Samsung TV and set-top box?

Pair the remote with the Samsung TV;
- hold down setup button until power button turns from red to green,
- enter one of codes at http://customer.xfinity.com/remotes

Pair the remote with the setup box;
- hold down setup button until power button turns from red to green,
- tap Infinity button,
- follow on screen directions,
- in no directions appear, try un-pairing device,
- detailed instructions at Xfinity XR2 Support

PSA: Comcast is a quasi-monopoly that should be prohibited from content creation or curation.