You can manage subscribers at CMS Desk -> Tools -> Newsletters -> Subscribers.
On this page, you can see a list of all subscribers of all of the website's newsletters. You can filter these by name or e-mail, by entering the desired value into the appropriate filter field and clicking the Show button.
By clicking the Delete () icon next to a subscriber record, you can remove the subscriber from the list and consequently from all newsletters they are subscribed to.
By clicking the Edit () icon next to a subscriber record, you can change the subscriber's details on the General tab. You have the same options here as when creating a new subscriber.
On the Subscriptions tab, you can select which newsletters this subscriber will be subscribed to. If you check the Send e-mail confirmation to the subscriber check-box, a notification e-mail will be sent to the user, informing them about the subscription changes.
Alternatively, subscribers of individual newsletters can be managed at CMS Desk -> Tools -> Newsletters -> Newsletters -> ... edit () Newsletter ... -> Subscribers. This tab displays a list similar to the one on the main Subscribers tab, but it only contains subscribers of the current newsletter. Clicking the Delete () icon here doesn't completely remove a subscriber from the system, only from the current newsletter.
If you need to add or modify a large amount of subscribers, the Import subscribers tab described in the Subscriber import and export topic provides an easier way.