Creating a Custom 404 Error Page
This demo will show you how to add a custom 404 Error Page through your cPanel.
The purpose of a 404 or Not Found error message is to let your visitors know that the server could not find what was requested. For example, if a visitor attempted to visit:
and you did not have a shop directory a 404 error message would be displayed to let the visitor know that the server could not find that directory (since it does not exist). With a custom 404 page, you can provide helpful information to the user and display links that may help them find what they're looking for.
 Locate the "Custom Error Pages" Icon located in the Advanced Tools section of cPanel
 Select the Domain from the drop down menu you wish to create a custom error page for a select "Go"
 Locate and Click the "404-Wrong Page" link
 Enter your custom HTML into the editor box
 Select "Save" to create your custom 404 Error Page.