If you're using a mobile device, you may have a better experience using the Panopto app to view and download videos (you can still watch videos in the browser though):
The first time you log in, you'll need to enter your University of York details correctly. Type your university email address at the login screen.
Choose the University site: york.panopto.cloud.eu. You should then be presented with the University single sign in page via the VLE. Type your username (not email) and password and complete the DUO authentication.
Instructions are in the guides below.
Once you've opened the app, you can browse videos for each of your modules, watch them in the app or download for later.