What form do I file if my ex-husband is not following the rules in the final divorce settlement?

if your ex isn't following the court orders, file a contempt motion against them. Plan to have a process server personally serve the motion on them to insure proper notice. You also may want to try sending a written letter first demanding payment within 20 days with notice that if it is not properly paid, you will be taking them back to court on a contempt charge.