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.
JotForm Support Manager
In order to integrate the form with paypal, you must input an email address. Otherwise it won't let you to integrate the form.
If you have further questions regarding to this issues, we are here to listen.
I have moved your question to a new thread and you will be answered here: http://www.jotform.com/answers/565030