Important : this option is available ONLY for Facebook campaigns
This option is not available in every account. Please, contact us if you want to activate this feature in your account email@example.com.
Go to the "Welcome" step of your contest. Near welcome screens you wil fin a "not authorized countries" tab. Mention the countries that will not be able to access the contest.
You can also set a message that will be visible for the non authorized countries.