Help!!! I have changed under general where my site

Help!!!
I have changed under general where my site is from mybet4u.co.uk/wp to mybet4u.co.uk and copied the index.php to the root and changed the path to /wp and I now cannot access the wp-admin.php and the theme has not loaded.

Which file do I manually need to change back to the original via ftp to put it back as it was so I can try again.... or is there a magic way of getting to the admin

Thanks in advance, it was going live tomorrow and now lost everything :slight_frown: