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If I understand you correctly, you would like to insert the form to your webpage using the iFrame method. Please refer to this guide on how to get the iFrame code: https://www.jotform.com/help/148-Getting-the-form-iFrame-code
If you are referring to a function where you can insert an iFrame content in your form, please use the iFrame Embed widget.
If that is not what you're asking, let us know. We'll be happy to assist you. Thank you.