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.
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Unfortunately, I have not found if Divi theme provides a Lightbox option to load custom / remote content. It might be worth contacting their support to find out if they provide any work around.
If you can embed complete <a href code, you can try a Pop-Up code which is based on the HTML a tag.
You can also try to add our Pop-up / LightBox code into a Text tab of a Text Module to see if the code is processed by WordPress.
If you need any further assistance, please let us know. We will be happy to help.