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.
Are you asking if it's possible to make changes to an existing jotform of yours?
Yes, just edit it and make changes as needed.
You can also just clone your form from an existing form and make changes that way too if you want to leave the original unscathed for any reason.
If you meant something else then please clarify.