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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If I understand you correctly, you have embedded a form into your weebly site and would now like to remove it.
To remove the jotform form, all you have to do is remove the embed code you used:
In the HTML code of your site, look for the iframe script or the code you used and you just have to delete the script