I set up unmarked the View forum statistics, View the member list & View Who's Online for guest users but it still been showed in the whole site. How can I deactivated?
Are you using a custom theme?
That shouldn't be related to a custom theme. ;)
Do you have any errors in your forum error log?
Forum Error Log (http://docs.simplemachines.org/index.php?topic=150)
Have you recently installed any mods?
Can you double check to make sure those are still unchecked for Guests? Are you logged out when you try to view those areas?