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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Are you referring to the green lock on the browser's url field? Please note that all forms created in Jotofrm are secured by default. I checked your latest form and it already has the green lock as seen below.
If you are not seeing the green lock, you can add https before the url of your form just like in the screenshot.
If you need further assistance, please let us know.