Sadly, once an order is placed we cannot change or modify the order. The system we use prevents any changes to orders once placed. We are sorry for any inconvenience.
If you have ordered the wrong size, your best bet is to place another order for the correct size and reach out to see if we can cancel the original order. If the order has already shipped we will need you to return the item for a refund using our return center here: RETURNS.THECHIVERY.COM
Have other questions or issues? Reach out to customer care HERE.