Here you can see a list of the subscribers of all newsletters. You can manage the items in the list using the appropriate icon on the left side - edit () and delete (). New subscribers can be created by using the New subscriber link.
Subscribers in the list can be filtered by their e-mail or name.
If you wish to manage only the subscribers of a specific newsletter, this can be done by editing () it on the Newsletters tab and then switching to the Subscribers tab.
More resources can be found at:
Page url: http://devnet.kentico.com/docs/5_5r2/contexthelp/index.html?subscribers_tab2.htm