Order (Relief from Support Payments and Commitment). PDF. 4-16. Notice of Motion To Quash, Fix or Modify Conditions of A Child Support Subpoena.1. Fill out a child support modification petition. 2. File the petition with the Family Court that most recently established your order. 3. Use this program to ask (or "petition") the Family Court to change a support order if there is a "change in circumstances." Step 1: Fill out these forms. If you are asking for child support or a change to your child support order, fill out the Summary Form for Financial Information. D I request that additional orders regarding child custody set out in D form FL-341 (D) D other be approved. h. Check the box that applies.