For the distance rate settings, go to WooCommerce->Settings->Shipping->Distance Rate on the admin panel.
Google API key
Enter the Google Key for Distance Matrix API. ( Application restrictions: IP addresses ), for more information on how to create the Google key, click here.
Transportation Mode
Select a transportation mode to use for distance calculation. the following modes are supported:
Driving
Bicycling
Walking
Distance unit system
Select a unit system to use for distance calculation. you can choose Miles or Kilometres
Show the distance
Show the distance next to the shipping cost.
Show the travel time
Show the travel time next to the shipping cost.
Debug
Show debug notices on checkout.