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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My apologies, but I don't quite understand your question. Which information are you trying to change for your text box? Are you unable to input data into the text box of the active form or are you trying to update the label for your field? If you can provide a bit more information and if possible a screenshot of what you are trying to change, we will be happy to help you get things the way you would like.