After importing the demo content you have to setup the menu and the home page.
Navigate to the Appearance > Menu. Go to the menu location tab and select main menu and the footer menu like the screenshot bellow –
Home Page Setup:
Navigate to Settings > Reading. Choose ( Static Page ) for front page display. And select the Home & Blog page form the page selection dropdown. After choosing the pages make sure you save the settings.
This theme support multiple home pages example, so you can select any home page for the front page.