What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
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!