Fill in the recipient and your address; for bills, include an account number; sign it; keep proof of payment. Check that the money order amount is correct.Take your money order receipt to any Post Office facility. Filling out a money order is a straightforward stepbystep process. Just follow these instructions and you'll be ready to send your money. Decide on the money order amount. 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. I'm going to show you how to fill out a money order from the USPS or the United States Postal Service. The money order has a purchaser section, which you'll fill out with your name and address. Money orders are a safe alternative to cash or checks.