Security upon turning on the computer

Hello,
I was wondering how I put a login password screen right after turning on my computer. I am new to iMac and trying to learn the neat things it does, but wanting to put that security on my iMac, so only I can log on only and one else.
Thanks for the help.
Joanne

Open the Accounts or Security panes of System Preferences and disable automatic login. It's under Login Options in the Accounts pane.
(51679)

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