How do I restrict a user from submitting a form?

I am wanting to restrict a certain user from repeatedly submitting forms how do i do this

We have two options that you can use, the Unique Submissions or Unique Question. Here's the link:

How-to-Set-Unique-Submissions-on-a-Form - It will limit the user for multiple submission using the same IP address and same browser. (https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form)

How-to-set-Form-Limits-Based-on-a-Unique-Question - It will limit the user to a certain question like phone number, email, or anything you preferred for a question. (https://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question)

I hope this helps. Let us know if you need further assistance. Thank you.