If importing went successful, you will see menu already. To Setup menu as per your need, please go through these steps:
Main menu/ Primary menu is the most prominent menu for the theme. Mostly appears beside logo.
- Go to Appearance > Menus.
- In Manage Locations tab, you can choose the menu from dropdown list for Primary Menu.
Always hit "Save Menu" if you are satisfactorily done modifying the menu.
Please note that in this theme, the logo appears in middle of menu bar. So if you have less than 6 menus, it might look odd. I recommend you manage to have 6 menu items for perfect use of design style of this template. If you can not, please contact support so that I can provide solution for menu items display.