If the product has quality issues, you can apply for a return or exchange through the after - sales application function on the platform within a certain period of time after receiving the product (usually 7 days or 14 days, depending on the platform policy). You need to provide a detailed description of the quality issues and photos as evidence. The platform will review your application. If approved, you will need to send the product back to the specified address according to the platform's instructions and may have to bear the shipping costs (some platforms or sellers may cover the costs). After receiving the product, the seller will process the refund or exchange for you.