change root passwrd

rehab240 Said:

"then i notice there is user to be logged in on my mac when I restart it there is me as an administrator and 'other' when I click to other I see that I can put a username and password to logged in my device !! how this could happen!! And what I have to do to remove that option when I log in"

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That's the Root User Login Window:

Having enabled Root user, this login is going to popup. IOW: That login is for the Root user.. Hide the Root user, and that login will not show up. So, stay away from Root user, to prevent any mishaps from being made.

That is a really bad idea

If you wanted to run around a Terminal session as root, then you just

sudo su -

and you are a root Terminal session user, without allowing script kiddies to probe your system for root access. Since you have enabled root it is possible someone will guess your root password, because they try all the time on the internet to probe systems for root access.

Finder -> Go -> Goto Folder ->

/System/Library/CoreServices/Applications/Directory Utility

At that login does this work?

Log in as the root user

When the root user is enabled, you have the privileges of the root user only while logged in as the root user.

1. Choose Apple menu > Log Out to log out of your current user account.
2. At the login window, log in with the user name ”root” and the password you created for the root user.
3. If the login window is a list of users, click Other, then log in.

https://support.apple.com/en-us/HT204012