Sorry to hear that you are having technical difficulties with the website. All pages and videos are working fine.
If you are having trouble with the videos, the first thing to try is to try closing your browser and starting over. If that doesn't work, try emptying your computer's cache
(See here for instructions: https://its.uiowa.edu/support/article/719 ) and then restart your computer.
If you are having trouble with login, please watch this video. It should answer your questions:
If you are still having difficulties after trying the above, you could try using a different computer. Please email if you still need further assistance.