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 do that you would need to go to your Account by clicking on the little avatar like icon in the top right corner. Once you go there, click on the Profile section (http://www.jotform.com/myaccount/profile) and you will see the field to edit password.
When you hover over the Password field you will see the option to edit it
Do let us know if you have any issues with this or if you have any further questions.