Did you get a notification that you have sold a photo? Congratulations!
You can find information about money on your account in the app: Menu - Withdraw money.
If you want to withdraw it (send it to your PayPal account), you need to have at least $5 on your account.
If you already have $5 or more, choose the "Withdraw Now" button. Your PayPal account needs to be verified. If everything goes fine, you will see confirmation with the expected payment date:
Processing payments around the world is quite complicated, so it usually takes 30-60 days from the withdrawal date.