You can add many different links to your menu. This article will show you how.
1. Click Customise
2. Click Menus
3. Select the menu you want to edit (this will normally be called "Main Menu")
4. Click "Add Items"
5. Click the page you want to add
6. Your page will be added to the bottom of the menu, you can drag and drop it to change the order. To make is a sub menu item drag it to the right so it indents the parent item.