The MailChimp subscription form in Music Pack for Elementor plugin saves the email address to your selected audience list. That is why, before using the MailChimp Subscription Form widget, you need to insert your MailChimp API Key and Audience ID into the plugin settings.
- On your WordPress admin, go to Music Pack – Widgets Settings
- Insert your MailChimp API Key and Audience ID into the dedicated fields
- Click on Save Changes
Please check the MailChimp Help Center to see how to get Audience ID and API Key.