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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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.