Please contact our support team with details viasupport@yeswelder.com, or call Call us at：(855) 937-45679/ (855) YES-4567 9AM-9PM EST, our support gagent will assist you with the change. Note: All changes or cancellation should be made within 1 day of the order time. Or the change or cancellation will not be available if it is already handover to warehouse. If it is too late to cancel, customer will need to shoulder the shipping cost to return the product.