Access Kanopy. (If you're off-campus, you will be prompted to login with your myPVCC username and password)
Enter your search terms in the box at the top. A list of possible videos will appear; click one if it looks useful. If not, hit the Enter key or click "View all results."
After selecting the video, click Play to watch it.
One thing to note is that many videos in Kanopy are part of a larger collection. For example, "The Sombrero Galaxy: An Island Universe" is actually part of a documentary series called Experiencing Hubble released by The Great Courses company. You can see other videos in the collection below the video: