1) Connect your Formidable form to Convertkit
Go to Forms => Global Settings => Convertkit.
-Convertkit API Key: Enter the Convertkit API key. API key is visible on your Convertkit dashboard.
2) Send form data to Convertkit
Go to Forms and edit one of your Forms. On the tab click on Settings => Form Actions.
Add the Convertkit Action & select Form & map Convertkit fields with a form fields.
That’s it .. Now when you submit the form it will add new subscriber in Convertkit.