This tutorial shows how to set a default Shipping Carrier in PrestaShop 1.6.x.
Log into the backend of your PrestaShop store and navigate to Shipping -> Preferences.
Scroll down to CARRIER OPTIONS section.
Select the needed carrier from the Default carrier dropdown.
Here all the available carriers will appear together with carrier best grade/price type.
Save the changes:
Feel free to check the detailed video tutorial below: