I can not password protect logging into my account in Ubuntu 12.10

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http://askubuntu.com – When I start up Ubuntu 12.10 I see the login screen. I have my account and a guest account as the choices. When I choose my account by clicking on it, I automatically get logged in with out being required to enter my password. I want to password protect my account so when someone clicks my account, they have to enter the proper password to get in. I have tried to do this by going to Settings > User Accounts > My Account and pressing the Unlock button in the top right corner of the window. I get the Authentication is required to change user data pop up and I enter my password to get acces (HowTos)