ActiveCampaign is an app that helps you to perform email marketing automation. This action creates a link between this app and your form, allowing you to use the information from the form fields in the ActiveCampaign account.
To connect the form and the ActiveCampaign account, you have to generate the API URL and key. Copy those two codes and paste them to the API URL and API Key bars.
To obtain more detailed information about generating the key and URL, follow this link.