You must have Gravity Forms and the Groups plugin installed and activated on your WordPress site.

Some of the integration features require Gravity Forms Add-Ons which are only available to those who have a Elite License (previously Gravity Forms Developer license).

Please follow these Installation Instructions for extensions to Groups.

After the extension has been activated, a new Groups section is available in the Form Settings tab of each form.

Groups Gravity Forms Form Settings

There are also general settings available for the plugin under Forms > Groups.

Groups Gravity Forms Settings