JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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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.