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I would like to clarify that this gadget is not from JotForm. Please follow these steps in order to embed your non-SSL form to you Google site.
1. Go to your Google site.
2. Switch to Edit mode.
3. Open Insert Menu and select More gadgets at the bottom.
4. Select Embed Gadget.
5. Put your form iFrame embed code, adjust gadget width and height, then press OK.
For your reference: https://sites.google.com/site/amslerclassroom/using-an-embed-gadget
Hope this helps. Thank you!