Fill in the recipient and your address; for bills, include an account number; sign it; keep proof of payment. In the "Pay to" or "Pay to the order of" field, write the name of the person or business you are paying.When filling out a money order, you'll need some basic information, such as the recipient's name and your address. Check that the money order amount is correct. How can I buy a money order? S020 describes the standards for issuing and cashing money orders. It also covers nonpostal services such as migratory bird hunting and conservation stamps. To fill out a money order you need to first fill out the who the payee is, the purchasers information and sign it. Make sure the amount is correct. Fill in the recipient's name.