How do I add a confirmation-request email to a sign-up form?

To add a confirmation-request email to a sign-up form: 1. On the sign-up form “Complete” step page, check the " Send Welcome Email Requiring Confirmation " checkbox 2. Enter an email subject 3. Enter your HTML message. 4. Click "Save" NOTE: If this option is active, the newly added contacts would not be visible in your contact list until they confirm their opt-in.