Help! Accidentally changed site name, admin won’t load, site has no design

I can’t even get into my admin to see which version, but I think it’s the next to the latest.

HELP! In settings, I changed http://gofarwithadd.com/blog to http://gofarwithadd.org and now when I try to get into my admin, it says “no input location” and the whole design of my blog is gone.

How can I correct this if I can’t get in? 🙁

THANK you for any help!