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Dear suk rider - You cannot simply "put yourself" on child support. Assuming you are a residential parent of a child and have legal custody then you would have to make a motion to the court for a determination of child support from the other parent. If you are asking how to start paying support then you can file a motion with the court to determine custody, support and any other issue involving the child.
I really cannot comment further on this limited fact situation.
David Kennett - JD - Attorney at Law