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.
Please do check this guide to learn more about the fillable PDF: http://www.jotform.com/help/312-Fillable-PDF-Everything-you-need-to-know-about-JotForm-Fillable-PDF-Creator
You will need to log in to your www.jotform.com, then click "Create PDF form". If you would like to create the fillable PDF form in the JotForm iPad/iPhone App, unfortunately, it does not have that feature. The JotForm iOS app is usually for viewing your submissions and getting notifications.
Do let us know if you end more help on this.