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.
If you would like to sign the form offline. The easiest way I can think of would be to add a Text Tool in your form and add the text:
Example Form: http://form.jotformpro.com/form/41219000538949?
I added the Text Tool from here:
This is a very basic method, it will only work to have a line where to sign when the form is printed.
Do let us know if this does not work for you. Thank you.