Custom message

I have a menu item for a category blog that can only be viewed by members. At the moment when non-members click on the menu item they get a 404 error message. How can I change this to a custom message asking them to sign up or saying that this section is for members only?

I think you can use this method membershipprodoc.joomservices.com/resour...ss-to-any-pages-urls to restrict access to that page/menu item

Tuan