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.
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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 suggest following these steps: Adding Form to Blogger
Do let us know if you follow them and still not able to get it to work, but then I would need to ask you to give us the link to the blogger page where the jotform is so that we can see what is going on.