Hi phamd4,
Where did you find the info on the root password (which web page are you referring to) and what did it say? The login is only possible under user: pi and pw: raspberry. It is not recommend to log in as root. You can operate any root functions using the prefix „sudo“ in your command. You can also log into root from the user pi, using the command „su“ and the pw „max2play“. However, we do not recommend doing this for simple tasks.
Please tell us where you found wrong documentation on the login so we can edit it to the correct current status.