There are a few ways to return Amazon products for free:
If you received the wrong item, Amazon will ship the correct item to you for free and you can keep the original item.
If the item you purchased is defective, Amazon will refund your shipping costs and give you a free replacement.
If you change your mind about an item, Amazon will refund your shipping costs if you return the item within 30 days.
To return an item, log into your Amazon account and go to the "Your Orders" page. From there, select the order you want to return and click the "Return or Replace Items" button.