Fill out the money order at the counter with a retail associate. Pay the dollar value of the money order plus the issuing fee.To fill out a money order you need to first fill out the who the payee is, the purchasers information and sign it. How to fill out a USPS money order? Money order; Cashier's check; Business checks. Please make money orders, cashier's checks and business checks payable to John F. Warren, Dallas County Clerk. You can make your checks or money orders payable to the Office of the Attorney General. Where should my payments be mailed? Write the date you are filling out the check including: day, month and year. The ABA routing number with the check digit in the transit field (0000-0020 or 000000204) is shown on each money order.