How can I remove all password in my mac osx 10.8?

I want to remove the login for my macbook air, I search the web but nothing useful, and a message came up said the "message want to use my key" something also. I just don't want a login password. thanks

Start "Recovery Partition" ("Cmd+R" during boot). Go to "Utilities" and open "Terminal" and once there type: "resetpassword" (without inverted commas).
Then choose the disk and the accounts you want to change.

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