Use the no webmaster level privilege-level command to delete all the usernames and passwords
with a specified privilege-level.
Use the no webmaster level privilege-level username name command to delete the specified
username and password.
Usernames and passwords come with three permission levels, each of which includes at most
10 usernames and passwords.
The following example configures the username and password for Web login authentication,
Ruijie(config)#webmaster level 0 username ruijie password admin