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1. Swipe in from the right edge of the screen (or if you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up) and tap (or click) on the Search icon. 
2. Type "power options" and tap or click on "Settings". 
3. Tap or click on Power Options.
4. In the dialog, tap or click on "Require a password on wakeup". It should default the Password protection on wakeup setting to require the password. 
   1. If on a laptop, it is recommended that you also set your computer to sleep when you close the lid (usually a default setting).
5. Make sure your computer is set to sleep after a period of inactivity. 
   1. Tap or click on Power Options to go back a step, and then tap or click on "Change plan settings" to the right of whichever power plan is selected.

   2. Next to "Put the computer to sleep", choose the length of the period of inactivity before the computer will go to sleep. 

   3. Choose a time that's not long enough for an unauthorized person to use your computer, but not so short that if you stop working at your computer for a moment, the screen saver locks it.

6. Tap or click Save changes if you have made any.

Mac OS

Apple Documentation: http://support.apple.com/kb/PH11083?viewlocale=en_US

1. Choose Apple menu > System Preferences. Image Added
2. Click Security & Privacy.
3. On the General tab, check "Require password ... after sleep or screen saver begins." Image Added
4. Set the time period drop down to your desired amount of time.

   1. Choose a time that's not long enough for an unauthorized person to use your computer, but not so short that if you stop working at your computer for a moment, the screen saver locks it.

Locking the Computer

Windows XP

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1. Press the Windows logo key + L.

Mac OS

Apple Documentation: 

• http://support.apple.com/kb/PH10836?viewlocale=en_US (requiring a password after screen saver or sleep)
• http://support.apple.com/kb/PH10883?viewlocale=en_US (setting your Mac to log out after inactivity)

To require a password after your computer has gone to sleep, follow the directions above for locking a screen saver on a Mac.

To lock your Mac: 

1. Choose Apple menu > System Preferences. Image Added
2. Click Desktop & Screen Saver.
3. Click Screen Saver.
4. Click Hot Corners... Image Added
5. Set one of your corners to "Put Display to Sleep".
6. Click OK.

To set your Mac to log out when not in use:

1. Choose Apple menu > System Preferences.
2. Click Security & Privacy, and then click General.
3. Click the lock icon at the bottom left to unlock it, and then type an administrator name and password.
4. Click Advanced.
5. Check “Log out after ... minutes of inactivity.” Image Added
6. Set the amount of inactivity time before the system automatically logs out. 

   1. Choose a time that's not long enough for an unauthorized person to use your computer, but not so short that if you stop working at your computer for a moment, the screen saver locks it.

7. Click OK.
8. Click the lock icon again to prevent further changes.