You can manually add one of your recipients to your Global Unsubscribes list here.
Simply click the gear icon, select Manually Add Recipients, and enter the email address you would like to add. Finally, click add. If you would like to add more than one recipient, separate the addresses with commas or a new line.
Any email addresses you add to your global unsubscribes list will not receive any of your email. Even transactional emails such as password reset emails and account confirmations. All requests to deliver to addresses on the global unsubscribes list will be automatically dropped.