This video will show you how to connect Gravity Forms to Activecampaign, and the best practices for configuring it too.
The Plugin can be added underneath “Add Ons” in the Gravity Form settings. Alternatively, it can be found in the Melt Google Drive Folder for WordPress Plugins.
For more documentation visit: https://docs.gravityforms.com/category/add-ons-gravity-forms/activecampaign-add-on/