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 suggest to take a look at the following guide in regards to adding a tab with a jotform to your Facebook page: Add an iFrame Page-Tab to your Facebook fan page | Filemobile Developer Documentation Portal
If you have any questions along the way, do let us know.