I am getting a DNS error when I try to watch the videos.

Most of the time, when you get a DNS error on watching a video that is not widespread. It is actually a setting on the local computer that requires a few steps to rectify. 
Try checking out this link for more information on how to fix the problem. 
https://www.drivereasy.com/knowledge/solved-server-dns-address-could-not-be-found/)