How to prevent users from making multiple submissions on a form

people can easily make junk entries by reloading the form.. i had to change form again and again because of this junk thing... there should be quota for an ip address to make on 10 or less entries per day... otherwise shit can get fucked up

Go to Preferences then on the tabs go to Form Limits, you have multiple options to limit the amount of submissions.

@gfregister 

As @kingkest mentioned you can set Unique Submissions on a form to prevent users from making multiple submissions on a form. Inside of this guide you can find out how to do it: https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form 

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

Hope this will help. Let us know if you need further assistance.