How can I set a password on my Mac Mini so someone else cannot open it and read emails, etc.?

How can I set a password on my Mac Mini?  Someone else is reading my emails.  I would like to be able to lock it so nothing on it could be seen without a password.  Is that possible?  How?

So uncheck the automatic login after making sure you know your password and it will require a password on startup.
You can also go into the security preferences and have the machine lock itself once the screensaver is activated. This is sometimes controlled from the screensaver preferences as well.
You could also go nuts and activate multiple users where your name appears in the menu bar. When you walk away from the machine you can use that menu to take you to the "login window", effectively locking your machine.

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