If somebody buys your photo, you will be paid to your PayPal account which you have to connect in our Foap app.
To connect it:
Go to the menu in the app and click on the "Settings",
once you're there choose "Cash out settings".
In "Cash out settings" enter your PayPal email twice, so e.g. if your PayPal email is "email@example.com" then you would have to enter "firstname.lastname@example.org" in the top field and confirm it by entering the same "email@example.com" in the bottom field.
Go to the menu of the app and click on “Withdraw money”. Then click on "Withdraw now" and you should be able to enter your PayPal email there. If you want to change your PayPal email click on the gear icon on the same screen and you should be able to change it from there.