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 am not sure if I have understood your question correctly. Do you want your users to be able to sign on form?
Yes it is possible to achieve your requirement by adding signature widgets in form. Please click on the following URL to check all the available signature widgets: http://widgets.jotform.com/search/signature
Hope this helps.
Do get back to us if you have any questions.