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'm not sure if I understand your query correctly. If you want to edit a theme that is applied to your form, it may be edited from the Form Designer.
You can find different sections from the Design tab in Form Designer that can help you in editing the theme.
Hope this information helps! If you are referring to something different or need any further assistance, please let us know. We will be happy to assist.