How does Mac cancel the power-on password?

How does the Mac cancel the power-on password? Many settings Mac user set the system administrator password to find every boot need to enter the password to enter the system, so sometimes appear superfluous, then we do not change the situation of the administrator password to cancel the Mac boot password settings? Please take a look at the following small series to bring you a graphic tutorial.

First step, open System Preferences, click on "Users and Groups"

The second step, click on the lower left corner of the lock icon, unlock users and groups, you need to enter the current user name password, enter and click "Unlock"

Third step, click "Login Options", click "Automatic Login" after the option button, click Select Current User, close the settings screen!