Money orders are safe alternatives to cash, and filling them out correctly is key to avoid payments getting canceled or refunded. Fill in the recipient and your address; for bills, include an account number; sign it; keep proof of payment.Here's a step-by-step guide on when to use a money order, where to get one, and how to fill it out correctly. Steps to fill out a money order Fill in the name of the payee. Include your address in the purchaser section. Fill in the recipient's name.