My log in screen is out of whack

I know what I did wrong and I’d like to be able to change it, but I can’t.

I was testing something in the settings, I was changing the URLs of my blog to see if I can get it to move to a different directory like that (Nope.) and I must have not changed the address back properly. I go to my usual log in screen and it looks like this:

https://bigmikedesign.com/blog/wp-login.php

I try to log in and it sends me to a 404 error page here:

https://www.bigmikedesign.com/wp-login.php

It’s because my blog is located in https://bigmikedesign.com/blog/, but I changed the settings to access it in my main directory just as a test, but I must have not put the homepage and blog URLs back properly. Obviously my theme is not working either, so I’d just like to get it back to normal but I can’t log into the admin area.

I’ve tried making a new .htaccess file but that didn’t work. ANy help would be appreciated.