If Advanced mode is chosen, it is not possible to access the Menu Preferences page, as these preferences are no longer valid. Advanced mode is not available in all SportVault packages.
When you first customise the menu a single item will appear - named Root. This is the top level of the new menu, and all items are created as 'child' items of the Root level. Any changes you make do not take effect until you click the Apply Changes button at the bottom of the screen.
Once this is clicked, the new menu is available immediately on the public site.