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When you say "GA code", are you referring to Google Analytics code? And when you say "confirm page", you're referring to the Thank you page right?
This is the form you're working with right? http://www.jotform.co/form/51037599957875
If you use custom URL as a thank you page, the analytics code you've used in the form is different from the custom thank you page. Unless, the form is embedded on a webpage where the code is. You can use the Google Analytics Widget for the analytics inside your form.
I can see that your form is not yet embedded on your webpage and that the custom thank you page in your form is not available. If this is not what you need, please provide more details about your issue.