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.
To my understanding, you would like to have a way to add fields to your form when your form respondents click an "Add Text Field" button, is that correct? I'm sorry, however, there is no other button that can be added to Jotform aside from the "Submit" button.
To learn how to set up your Configurable List widget, I suggest you refer to this guide: How-to-Set-Up-the-Configurable-List-Widget
I hope this helps. If, in any case, I have misunderstood your concern, please feel free to contact us anytime to provide us more details. Thank you.