Navigation Links
Navigate to CONTENT > PAGES > NAVIGATION tab
The parent navigation items display as heading in your website menu and the related, child-level links, will display below.
Editing Navigation Links
You can reorder the navigation items by clicking and dragging them in any order you'd like. Use the arrow to toggle wether the child-level items are shown or not. You can click into a navigation item to change the display text or where that item links to.
Resources: