Menu / Navigation
If you do not specifically create a menu, WordPress will provide a default menu for you. The default menu contains all the pages on the site in the order in which they were created.
We recommend that you manually create a menu that specifies the desired navigations for your site. Once you create a navigation menu, you should assign it to the Top Nav theme location. This will cause your menu to be displayed as the top navigation for your site, and will enable the highlighting of the current page in the menu.