Write your address in the purchaser section. Include your account number if you're paying a bill.To fill out the money order, you will need to "Pay to" U.S. Department of Homeland Security. Instructions for Completing Money Order Inquiry Form. It's similar to signing a check. You'll see a line for the purchaser's signature, usually on the front of the money order near the bottom. 1. Buy a money order for the desired amount. 2. Fill in the "Pay to the Order Of" line. 3. The Certificate of Assumed Name must be typed or printed in black ink. If enclosing a payment (check or money order and Form IT-201-V), mail to:.