JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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 believe this guide might help you: http://www.jotform.com/help/22-Adding-Form-to-Facebook-Pages. If you are adding the form to Facebook, as mentioned by the guide above, This method is using HTTPS or Secure URL feature. This is to avoid any security issues on the page since Facebook requires secure protocol.
Please take note that free users are only allowed up to 10 SSL submissions maximum per month (since you are using HTTPS version of your form). You should consider upgrading to a paid plan if you expect to receive SSL submissions in excess of 10 per month.
Let us know if you need more information on this.