Throne uses standard WordPress menu system for navigation. In order to set up the top navigation menu, go to Appearance -> Menus.
You simply need to create your menu and drag and drop pages you want to show. After the menu is created, you need to assign this menu to Main Navigation theme location,
as shown in the image below.
Additionally, Throne provides another two menu locations. Footer Menu which is used inside the copyright bar at the bottom of your website and 404 Menu which is an additional menu to show on your 404 template.
Watch an example in this short video: