How to prevent duplicate entry

Hi jotform,

I've just made this form

If you don't want your user to input multiple submission based from a specific question, that is possible by following this guide: http://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question.

You may also check this guide: https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form

Let us know if you have any further query.

I am not sure if I understood you correctly, but if you want to prevent multiple submissions from the same IP address or Browser please follow this guide:

https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form