Your theme comes with several of built-in menu locations for your website.You can select which menu appears in each location.
To set menu locations, go to Appearance > Menus. For an improved user experience, we recommend setting menu locations through the Customizer as it helps you to preview your changes. You can access this under Appearance > Customize > Menus > Menu Locations.
In other cases, you can display your social menu or any other menu with the Custom Menus widget or the Grimlock Custom Menu Section widget in any widget area available for your theme.