To Hide a DNN Page from the Menu
Note: This page will still be available to those who know the URL of that page (if for example you had put the page in a news letter).
Select Edit / Page Settings
Page Details / Unselect the Include in Menu Option
The Page will no longer appear in the menu system. It can still be hit with the permissions that have previously been set.
Alternatively – To Change Permissions on the page to hide and stop access: http://www.interactivewebs.com/blog/index.php/general-tips/dnn-change-permissions-on-a-page-to-stop-users-being-able-to-access-the-page/