Updated permalinks and staging site broken

Hi there. So, I set up the staging site and built out the framework in Divi. Everything was working fine, until I created a new page and clicked a link that said “update permalink structure” or something of that nature. Now when I try to access anything on my staging site it just says:

Not Found

The requested URL was not found on this server.

How can I revert the permalinks so I can get back the work I already did on the staging site? No, I did not pay for the backup service.

The page I need help with: [log in to see the link]