It is not possible to return items bought from any private seller.
If you feel that the item does not match its description, you will be able to open a dispute on paypal. More on that here
Moreover if you have received an item from a seller on the mobile app or website and it's not what you expected or you have changed your mind, you can re-list the item for sale free of charge.
Please get in touch with the support team in case you need assistance.
If you’re facing any issues, please contact us.