JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
You cannot edit existing themes from the Theme Store, you can get free or paid themes in our Theme Store, but you cannot edit those themes and publish them as your own theme. However, if you apply a theme on your form, you could still redesign the form that has an implemented theme on it.
If you create your own theme from scratch using the form builder and the Form Designer Tool, then those themes can be edited by you, as long as you are the one who created it.
To learn more about applying a theme on your form, you can check this guide: https://www.jotform.com/help/184-How-to-use-your-JotForm-themes
Let us know if I misunderstood your concern.