It sounds like the words settlement and judgment are being used interchangeably here and there is a definite difference, which is why you asked the question. If the Judge entered a judgment, then you don’t have to sign it for it to have effect. The Judge cannot force you to sign an agreement like a settlement because they must be voluntary to be effective. Thus, to give you any advice on this topic, you’ll need to show what you signed to a lawyer and explain what happened. The Judge can Order you to sign documents to effectuate a prior Order. If you refuse to follow a Court Order that requires some affirmative action on your part and the Court finds you in Contempt of that Order, you can be held in jail, basically until you comply with the Order. There are always exceptions to the rule. Just based upon what you sent, it is possible that is what happened but again, anyone giving you actual legal advice will need to see the documents including the Court’s Orders in your case and the item you signed.