tried to change the path and now it broke

So I’m using WPMU and I just tried to change the name of my dir to blog instead of wpmu. I figured if I change it on the settings page first, then rename it in ftp it’d be fine. Noooooo no no I was wrong. I went into PHPMyAdmin and changed the value from /blog/ to /wpmu/ because I figured that would fix it, but no. I was wrong on both tries.

Any ideas for me to salvage my titanic?