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.
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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.
If you are referring the header in the Google Spreadsheet, you have to edit the field's label in the form to edit column's header. This is because each column in the Spreadsheet correspond to a field in your form.
Note that if you edit a field's label( Change the name of the field), you will have to re-integrate the Spreadsheet.
We will resolve your concern here https://www.jotform.com/answers/843391