Changing The Site URL

Hello-
I’ve found myself in the situation described here: https://codex.www.ads-software.com/Changing_The_Site_URL

I changed the “HOME” and “SITE URL” settings in hopes of renaming the directory, and now I cannot access the site through the Administrative URL.

I logged in via FTP(cyberduck) and located the wp-config.php ….
but the WP instructions threw me off right here:

Add these two lines to your wp-config.php, where “example.com” is the correct location of your site.
define(‘WP_HOME’,’https://example.com’);
define(‘WP_SITEURL’,’https://example.com’);

what is this?- “where example.com is the correct location of your site”
This is where i’m stumped, so I read into the next option of modifying the functions.php file…. but there is zero content on my site, so modifying the active theme’s functions.php file seems pointless?? I just finished installation of WP when i made this mistake. Please help! Greatly appreciated.

-Sam