Go to any Post Office location. Take cash, a debit card, or a traveler's check.In the "Pay to" or "Pay to the order of" field, write the name of the person or business you are paying. Only the person or business named can redeem the money order. Available without a bank account. Fill out the money order immediately and completely, leaving nothing blank. I'm going to show you how to fill out a money order from the USPS or the United States Postal Service. Fill in the recipient and your address; for bills, include an account number; sign it; keep proof of payment. To fill out a money order you need to first fill out the who the payee is, the purchasers information and sign it. What address should I mail my loan payments to?