Fill in the name of the payee. Know how and who you'll pay: Be prepared with cash or a debit card, the name of the payee and the amount you want to send.Go to any Post Office location. Take cash, a debit card, or a traveler's check. You'll also need a way to pay, such as cash or a debit card. You can use cash or a debit card. Locate a branch or make an appointment, find my routing and account numbers, dispute a debit card, check or ACH transaction, dispute a credit card transaction. Note: Debit card payments cannot be cancelled. Fill in the name of the recipient in the "pay to" section.