Follow the steps below to change your country:
-When Linked to a Nintendo Account-
Change the country/region setting for your Nintendo Account. You can access this option via the Edit profile menu.
-When Not Linked to a Nintendo Account-
Change your country/region by choosing a country or region in Country/Region under Options, found within Settings in Menu.
Note: You should only change country/region settings when your country/region of residence has actually changed.