Here are some common issues and how to fix them:
I forgot my username or password: https://support.edpuzzle.com/hc/en-us/articles/360020027492
How do I leave a class?: https://support.edpuzzle.com/hc/en-us/articles/360020027812
How do I redo an assignment?: https://support.edpuzzle.com/hc/en-us/articles/360020285591
If the video won't play, your progress isn't being tracked, or any other issue, let your teacher know and ask them to reach out to the Edpuzzle support team!
They can contact the Edpuzzle support team using the "Contact us" button to the right of the search bar on the Help Center page or review the list of articles to see if we have already have one which addresses your issue: https://support.edpuzzle.com/hc/en-us