How can I add a custom made error page?

You can use .htaccess to show your visitors a custom made error page, instead of a standard server returned error code. The most common errors to create pages for, are Page Not Found (404) and Forbidden – Access Denied (403).

Add the following code to your .htaccess file:

ErrorDocument 403 ErrorDocument 404

Replace and with the location of your custom made error pages.