Depends on the order status. Check it in your order history.
Status "Awaiting payment"? Cancel the order and place a new one with the correct products.
Status "Payment accepted"? Get in touch as soon as possible. Call us at +1 (828) 415-3679 for the fastest response. We can adjust the order if it hasn't been packed yet.
Status "Preparing order" or "Shipped"? Unfortunately, changes are no longer possible.