giving root access

Hi, I know there has been enough discussion on this, but still cant
find the right answer.
If I change the /etc/sudoers file by visudo and try to give any user
root access, why cant i use adduser, or passwd?

# User privilege specification
root ALL=(ALL) ALL
zix ALL=(ALL) ALL

[zix@dns comps]$ adduser zix1
adduser: unable to lock password file

passwd sandy
passwd: Only root can specify a user name.

how do I make the change?any quick help please, somebody..
.

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