Hello Colleen, and thank you for posting to our community!
If you need to cancel a shipment for a refund, we make it easy to do so from your Shipment History, using the steps listed in the link below.
Cancelling a USPS label will send an automatic refund request to Endicia. When approved, your Endicia carrier balance will be refunded for the postage amount paid. Endicia takes 14 to 20 business days to process refunds.
Thank you and happy shipping!