I have lock my MacBook air for everyone. How can I unlock it?

I have lock my MacBook air for everyone. How can I unlock it?

If you do it only for your user, you can try resetting permissions > http://osxdaily.com/2011/11/15/repair-user-permissions-in-mac-os-x-lion/
If this doesn't work, open Disk Utility from Recovery (if you have OS X Lion or Mountain Lion, pressing Command and R keys while your Mac is starting) or the Mac OS X DVD (if you have Snow Leopard or older, pressing C key while your Mac is starting), select Macintosh HD in the sidebar and repair permissions.
If this doesn't work, reinstall Mac OS X

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