What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
If I understand you correctly you would like to a form so your user can only submit once. If I am incorrect, please feel free to correct me.
There is no way to limit a user, so he can only submit once. But Jotform contains feature that can limit submissions. If you enter the preference button on the top toolbar
and go to the LIMIT FORM tab, you will notice the option UNIQUE SUBMISSION
Here you can limit the submission of the form.
The LOOSE CHECK will verify that the user does not use the same browser to submit, using cookies.
The STRICT CHECK will also verify the IP so your users does not use the same device.
Please let us know if this helps.