Unfortunately, the only way to change the shipping on an order is to cancel the original order that was placed and then resubmit a new order.
We absolutely cannot guarantee, though, that your order is not already in production, so please call us at 1-888-367-3837 or email support@forever.com to check if the original order is able to be cancelled and refunded before placing a new order.
We do provide shipping estimates at checkout to help you choose the most appropriate shipping method for your situation.