Sorry for asking such this easy question. But I actually do not know how set the password my iMac. I mean I want the iMac is in Password protection mode when it goes to sleep mode, and then asks for password when we wake it up.
How to manage password protection on my iMac?
Mac OS X is not complicated at all. You can access System Preferences —> click on Security & Privacy. Make sure you check on “Require password” option.
You might need to click on the Lock logo at the left-conner at the bottom (administrator password is asked).