how i can edit the full source code of my form

Hello swapna_summit,

You can download your form's full source code and edit it as per your requirement. The following guide should help you download your form's source code:  http://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form

Please be noted that you should not "ID" of any fields as it is required to capture the user input on our server.

Hope this helps.

Do get back to us if you have any questions.

Thank you!