prefill

Are you trying to prepopulate form fields? If that is the case inside of this guide you can find out how to do it: http://www.jotform.com/help/71-Prepopulating-fields-to-your-JotForm-via-URL-parameters 

If you want to achieve something else, please provide us more details about what are you trying to achieve and we will be happy to assist you.

Let us know if you need further assistance.