Changed URLs and now can't login!

Hi, Please help. I’m trying to help a friend change their domain name but I don’t have much wordpress experience and cannot get back into their WP admin.

While last logged in to it at https://zpaintingcv.com/wp-admin/
… in Settings > General > I changed both the wordpress and site URLs from zpaintINGcv.com (old) to zpaintERScv.com (what we want now), then saved it.
The next time I tried to log in to the same wp-admin page (https://zpaintingcv.com/wp-admin/), I get the error message:

The site can’t be reached
zpainterscv.com’s server DNS address could not be found.
Search Google for zpainterscv login
ERR_NAME_NOT_RESOLVED

Note also how the error is now reflecting zpaintERScv and not zpaintINGcv.

Meanwhile when I visit the live site at zpaintingcv.com, it looks awful, the layouts all messed up.

Please, please help. How do I get back into wp-admin page to add least return the URLs to what they were before? Thanks in advance.