missing theme messup

I was editing my settings on https://www.flidmedia.com when I set the blog to appear on flidmedia.com/blog instead of just flidmedia.com. Now I can’t edit the site or even get into the back end anymore and it seems like my theme has disappeared. Any time I try and do anything, including getting into my back end, it seems like it redirects me to the actual front end without a theme.

Any help would be greatly appreciated.