404 Page

If you have set the auto-redirect setting to off or if the plugin was not able to automatically redirect a page, your visitors will see a 404 page.

By default, a 404 page is rendered from the 404.php file that's a part of your WordPress theme. 

You can use:

• a default one, 
• select one of the existing pages,
• or create a new page in WordPress.

Please note that in order to select a different page to act as a 404 page, that page has to be published & public.