Hi,

Go to Admin >> Location/Taxes >> Zones Definitions
Add a new Zone there
Then, click on the folder icon next to the zone name you recently added
and start adding countries to the zone.

These are the countries that will be allowed to use the shipping module.
Then, go to Admin >> Modules >> Shipping
Select your Shipping Module and click Edit
Set the Zone you recently added as Shipping Zone for the module and click Update