Form Designer - Having Trouble In Video Module
Design and Skin Customization
The steps to getting a Form Designer field to show are 2 fold.
First you must CREATE the Form Designer field so the user can enter the information in the form.
Second is you must alter the templates to show that field.
Check out this doc, it covers creating Form Designer fields and displaying them.
"HowTo: Form Designer + Aparna = Custom Page Module with RSS feed"
https://www.jamroom.net/the-jamroom-network/documentation/howto/2463/howto-form-designer-aparna-custom-page-module-with-rss-feed