How do I set "password upon wake up"?

hello:
as a suggested solution to my kernal_task eating up my CPU, one suggestion is to put password upon wakeup
see:
https://discussions.apple.com/thread/3262080?start=120&tstart=0
moonmen 
Re: kernel_task running wild!  
   Jan 26, 2014 2:19 PM    (in response to snow_bunny) 
(sorry not sure how to quote in this forum)
So, how do I put password upon wakeup?
thankyou

I don't if having a password on wakeup will fix your problem or if it does why it does, but you can set this by doing the following.
Open System Preferences
Click on Security & Privacy
Make sure the General tab is selected at the top
Tick (enable) the 'Require password - immediately - after sleep or screen saver begins'

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