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'm not that familiar with Zenfolio but upon searching the web, I see that other JotForm user's are embedding their forms by adding a custom page and under the HTML editor on it you can paste the embed form codes.
When your in your editor, you just need to find the icon "HTML" and add the embed form codes that we have. You can find the embed form codes by following the screenshot below.
I would recommend if you are adding it in an HTML editor, you can use the default Embed Code or use the iFrame Code.
I hope it helps. Let us know if you need more information on this.