From the Class Manager, click the Content Management tab.
Click Error Responses.
Choose Entire Server from the resource picker to apply your change to the whole class, or navigate to the document root for a specific virtual server, or to a specific directory or within a specific virtual server.
For each error code you want to change, specify the absolute path to the file or CGI that contains the error response.
For more information see the online help for the Error Responses page.