i cant change sshd_config. ssh direct root logins are permitted.

when i run security advisor, i cant change /etc/ssh/sshd_config in terminal WHM. i try this code. but i cant save. sed -i '/^PermitRootLogin/s/yes/no/' /etc/ssh/sshd_config
or vi /etc/ssh/sshd_config
#PermitRootLogin no
SSH direct root logins are permitted. Manually edit /etc/ssh/sshd_config and change PermitRootLogin to "without-password" or "no", then restart SSH in the "