Form Customizer allows Full Admins to build new tables, fields and forms.
How to Access Form CustomizerThe easiest ways to access the Form Customizer for a certain form is through a link on the form. Add/Edit forms have a link to their Form Customizer at the bottom left corner of the form, in light gray font that lights up only when you scroll over. View forms have a link to the Form Customizer under Advanced Options, at the very end.
The "Form Customizer" link in Settings, allows you to select a form from a full list of forms. Use the browser's Find function, by using Ctrl + F to search for the form by the forms name.