Subscribe WordPress Users Automatically to Mailchimp
Adding New Users to a List
If you want to add users to a select immediately after they signup using your registration form, then follow the instructions below.
Go to ProfilePress>>Settings>>Integrations>>Mailchimp and select the list you want users added to. Next, scroll down to Automatically Add New Users, check “Enable, ” and save changes.
NB: Activating this will render all list selections in registration forms inactive