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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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I checked your form and the signature panel is indeed not showing up. I did a bit more looking and it appears that it is conditionally hidden:
When all four of those conditions are met, the signature panel does indeed show up:
You may need to alter the conditions in order to get it to show up when you want. The limiting condition here would probably be the "16 weeks" one. Since there are quite a few selections in that drop down, the user would have to select a very specific choice in order for the signature to show.
Let us know if you have any further questions and we will be happy to help.