Here is the screenshot
--------------- Added [DATE]1370137354[/DATE] at [TIME]1370137354[/TIME] ---------------
I got the support from vbb supporting team (many thanks for that), go to share with you guy got same problem as me
Go into the AdminCP and then go to Channel Management -> Channel Permissions. Under Home, find the Administrator usergroup and set the "CanUseHTML" permission to No.