-App ID: Enter your iContact App ID. You will get it when you register you api application.
-API Username: The iContact username for logging into your iContact account.
-API Password: The API application password set when the application was registered.
-Account ID: You can get this below you created app name in iContact dashboard.
-Client Folder Id: You can get this below you created app name in iContact dashboard.
Go to Forms -> All Forms and edit one of your Forms. On the tab Emails & Actions you’ll see a + on the bottom right to add additional actions.
Click this button and add the iContact action.
-List: Select the List to which you want to add subscribers from your Form.
-Email: Select the Email Field from list of your form fields.
-Default Fields: Select any other fields you want to send to iContact.
You can add Opt-in checkbox by adding new field to your form.
Select GetResponse Opt-in field
Thats it ! You are all set to go.