Everything goes to "400 Bad Request"

You can find our website at https://www.sewardumc.com/pages/blog/.

Thought I’d try to get our new blog to point to “sewardumc.com” instead of /pages/blog. This was root directory stuff that I probably should not have been messing with. But, it didn’t seem to work so I changed it back.

BUT, now everything…EVERYTHING…to the left on the dashboard goes to “400 Bad Request”… themes, pages, comments, general that would be pretty much everything.

The site still appears online as a shell of its former self. “Log In” does not appear in the the Meta anymore so I can’t log in through it..

And I have the dashboard up in Chrome but I can’t utilize any of the tools. Afraid to close Chrome and have no access to anything at all.