If you are the person who will be paying child support, you should bring proof of your income. How do I apply for Child Support Services?You can complete the application at your local CSS office or apply online. Use our printable child support demand letter template to require someone to pay their owed child support. Download it for free here. Child Support Services (CSS) are available to anyone who needs help collecting child support through a network of state and locally run offices. Write the letter spelling out the time line and chronicle the events of your child being taken out of state without your knowledge and permission. This can often be accomplished online. Provides policy guidance on federal criminal nonsupport cases. The Mecklenburg County Clerk of Superior Court Office is open to the public between the hours of a.m.