Microsoft has oddly split the user account management in Windows 8. While you must add new users in the Metro Settings pane, other user account management tasks must be done from the Windows Desktop Control Panel.
Kapril-Arya provides a couple of power user shortcuts to this. The normal way to reach the Control Panel is from the Windows Desktop:
Charms -> Settings -> Control Panel.
Alternatively you can right-click in the bottom left "hot corner" to get a shortcut menu to common Windows administrative features. The Control Panel can be accessed directly there.
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