1. Fill out a child support modification petition. 2. File the petition with the Family Court that most recently established your order. 3.The name and address of the other parent. Modification of Support. Download a free child support modification form to propose changes to a current child support agreement. Available in PDF or Word format. Us with the subject 'Modify Order' and request a phone appointment. If you are asking for child support or a change to your child support order, fill out the Summary Form for Financial Information. If you are looking to file a child support modification petition, you can find the form for "petition to modify support. If you are looking to file a child support modification petition, you can find the form for "petition to modify support.