Hi i want to create a form that can only be used once by one individual let me say, if am registering individuals. e.g Id:123 name: mistangor lastname:gor age:25 sex:male so i don't want that person to be registered again once trying to enter the same information the system should send a massage …

Hi @Mistangor unfortunately it's not possible to refer to already saved/submitted forms when you fill a new form so you can't do that.