If when you’re trying to add Social Store you’re getting an error message that “You must have permission to add apps to at least one Facebook Page to perform the requested action." it simply means that you need to have a Facebook business page that you can add Social Store to.
Don’t confuse your Facebook profile with a Facebook page. Your profile only your friends can see and you can't add to it Facebook apps such as social store, but your business page everyone can see which can get you a great amount of exposure & traffic from Facebook. You can read more about the differences between the two here: https://www.socialstorepro.org/what-are-the-differences-between-a-facebook-page-and-a-facebook-profile.
You can easily open a facebook for free here: https://www.facebook.com/pages/create.
Let me know if you have any other questions.