When you click on the link in the email to review the video it should ask you to log into your account and then take you to a review page where you can approve or add revision requests. If you are getting an error code or blank page it could have to do with your login status.  Please close all browser tabs and then click on it again and it should bring you to your login page. If you continue to have trouble submit a ticket and we will look into it right away.