All of your basic navigation mirrors your document tree. If you want to change the order of pages in your dropdown menus? Just open the parent page and drag those subpages into your desired order.

Likewise, the top level navigation beneath the home page can also be dragged up and down into a new location.

Header navigation extras are found in Website Design and Layout. If you add a map link and email address? Those icons will be included in your header. The Quick Menu can also be edited and its order changed.