Manage local users and groups on Windows Server 2012

  1. Open Server Manager.
  2. Click Tools.
  3. Select Computer Management.
  4. Expand Local Users and Groups.
  5. Select Users or Groups.
  6. Double click on a user or a group.
  7. Do your stuff.

Note: This works only for servers that are not Domain Controller (in this case just open Active Directory Users and Computer).