How to send a promo code in an email after someone fills my form?

We are trying to set up an automated email reply for a casino who I work with for a promo code? 

The hidden page on the website has not yet been published. 

Ideas? 

I understand that you want to send an email to the person who filled the form with a promo code. Is that correct? If so, you may add an auto-responder email to your JotForm so that an email shall be sent to the form filling person after submitting the form.

Please refer to the guide below that can help you in adding the auto-responder email to your JotForm:

http://www.jotform.com/help/26-Creating-a-Form-Autoresponder

While setting up the Auto-responder, you may edit the email to add your promo code to the body of the email. 

Hope this information helps! If you are referring to something different or need any further assistance, please let us know. We will be happy to assist.