You may fill them out at home or at the courthouse. Please read the forms carefully as some have a "Verification" page.There are several steps to modifying a child support order. The first step is to file a Motion and Notice of Hearing for Modification of Child Support Order. Child Support (AOC). A parent may request a modification of a child support order whenever there is a change in circumstances. How do I apply for Child Support Services? You can complete the application at your local CSS office or apply online. In North Carolina, the only way to legally alter a child support order is to petition the court for a modification of child support. Child Support Services (CSS) are available to anyone who needs help collecting child support through a network of state and locally run offices.