LIMIT FORMULARY

Could you please provide us more information about your concern? Would you like to limit the submission on your form? What kind of limit? The number of submissions, based on a question or a limitation on an input field?

Here are some guides that allows you to set limits on your form:

https://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question 

https://www.jotform.com/help/137-How-to-limit-submissions-in-a-form 

If I misunderstood your concern, please do provide us more information.