Go to any Post Office location. Take cash, a debit card, or a traveler's check.Fill in the name of the payee. Western Union money orders offer a reliable, convenient alternative to cash or a check. Use them to give a gift, make a purchase, or even pay a bill. To purchase a money order, you can go to any United States Post Office location. Debit Cards are accepted for all services, except passport fees to the State Department (debit cards may be used to pay the USPS® processing fee). To fill out a money order you need to first fill out the who the payee is, the purchasers information and sign it. A deposit slip must be filled out and submitted with every money order. Fill in the name of the recipient in the "pay to" section.