Theme not showing and unable to login

I had edited my index.php and copied to the root directory using the following instructions. Except that I forgot to update my Permalink Setting.

1) Copy the index.php and .htaccess files to the root directory.
2) Change my index.php file as follows:
require(‘.//wp-blog-header.php’); to
require(‘./wordpress/wp-blog-header.php’);
3) Go to General and update the ‘Blog address URL’ to my base URL.
4) Update my Permalink Setting to use the ‘Day and name’ format.

Now the site displays without any theme and I get a “whoops” page when I try to login. Not sure how to correct this.

Here is the site in question: https://www.drfrohn.com/