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.
Can you please explain further what would be the overall function? Do you mean, if they enter the email address to the email field on your page, you want the entry to automatically populate the Email Field on Jotform?
Please consider checking this guide:
Example from your form: http://firstname.lastname@example.org
Let us know.