How Do You Determine What WordPress Theme Your Website Is Using?

Problem scenario
You use WordPress. You want to find (or identify) what theme you are using. What should you do?

Solution

1. Find the URL you use to browse WordPress (e.g., with wp-admin).
2. Hack (or create or draft) the URL in text by making it follow this convention: https://www.foobar.com/wp-admin/themes.php
3. Be logged into WordPress, and then browse to that drafted/hacked URL.
4. Search for the word "active".