Connect A Custom 404 Error Page To A Domain
Connecting a custom 404 error page to your domain takes just a few clicks.
From the dashboard view of your account, click Settings in the left menu.
Once in Settings, click Domains in the left menu.
Find the root of the domain you would like to connect a custom 404 error page to in the list and click the Manage button to the right of that domain.
Select the three dots next to the domain you wish to connect and click Edit.
Select your customized 404 error page from the dropdown under Set Default 404/Error Page.
Click save.
Check out the video below shows a past interface for connecting a custom error page to a domain at the beginning but then gives some examples of 404 error pages. The examples are still relevant and may be helpful for you. The video at the top of the page reflects the current interface.