Gravity Forms automatic creation of post – transfer post fields

Hello!

I created a form using Gravity Forms and every visitor who use it creates a new Draft post in our site. I use Post Fields of Gravity Forms. “Body” Post Field is filled from the visitor. I want to send more information to “Body” field than the one visitor fills.

More specifically, I would like to add text below the visitor’s text, which will have information from other Form Fields (Custom Field: End_Date, Custom Field: Link).

Please check the code below:

echo '
Visit?<a href="<strong><Custom Field: Link></strong>" target="_blank"><span style="text-decoration: underline; color: #ff9900;"><strong>this web site</strong></span></a>

<strong>End Date: </strong> <strong><Custom Field: End_Date></strong> <strong> ? ??</strong>? ?<strong> ?</strong>? ? ? ? ??<a href="<Custom Field: Link>" target="_blank"><span style="text-decoration: underline; color: #ff9900;"><strong>Visit page</strong></span></a>
';

Where should I put it? In Gravity Forms php files?

Thank you very much in advance!!!

George