All the Facebook Modules in the Divi Supreme use the Facebook APP ID to work perfectly and for this, you should have created an APP ID from the Facebook Developers site.
To first create a Facebook APP ID, you may see this guide here: https://docs.divisupreme.com/knowledgebase/how-to-create-facebook-app-id/
When you’re done with creating your Facebook APP ID you can now put it in Divi Supreme Plugin’s Page Settings. For this go to** Divi Supreme > Social Media Settings**: And in the Facebook APP ID field, Paste your Facebook APP ID which you’ve created already. Good Luck!