Top Menu - Only show level 1: Located in the right top bar content
Main Menu: Located in the main page header
Vertical Menu: Located in the left vertical menu (include on Header Layout 4 and Layout 6)
You can manage and create menus by navigating to Appearance→Menu
1.
Click the create a new menu link
2.
Enter a name for the menu (this can be anything e.g "Main Menu")
3.
Click the Create Menu button
2. Locations
Assigning Menu Locations
After creating a menu you can assign it to one of the theme's menu locations.
Click the Manage Locations tab and assign the menus to their appropriate locations.