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.
- If you are not seeing certain block on left side, for example Categories, please click on "Screen Options" on top right corner and select its checkbox and reload the page.
- Always hit "Save Menu" if you are satisfactorily done modifying the menu.