The Menu & Page Manager section allows you to manage the tabs in the left hand navigation menu. You can also use it to create new custom pages, Libraries and Forums. To edit the Menu & Page Manager, go to Settings > Portal Customization > Menu & Page Manager.
Left Navigation Menu
Edit Menu Items:
Edit the names and icons of menu items by clicking Edit or Actions next to the items you want to customize. To reorder the menu items, click the Reorder button.
Menu & Page Manager Screen