Discovery Education is such a great resource for classroom teachers. There is so much more to it than just "United Streaming" videos. There are assessments, assignments, projects, lesson plans, and Board Builders. If your school district is a Discovery Education district I hope you use it to it fullest. Start by creating classes in your account and giving each of your students their own log-ins. This will allow them access to all the tools you have access to as a teacher. If you are fortunate to have your students already enrolled into Discovery Ed on a building roster, it is extremely easy to enroll them into your class. If you do not have an uploaded roster, just look at the last few seconds of the clip to see how to manually upload students.
Check out the video below for help.