Specify the login user name and password to be used for "User Authentication Management" in the Address Book.
For the characters that can be used for login user names and passwords, see Usable characters for user names and passwords.
Log in as the user administrator from Web Image Monitor.
Point to [Device Management], and then click [Address Book].
Select the user you want to specify.
Click [Detail Input], and then click [Change].
Enter the "Login User Name" in the "Authentication Info at Login" area in the "Authentication Information" area.
Click [Change] for "Login Password".
Enter the login password in [New Password].
Re-enter the login password in [Confirm Password], and then click [OK].
Click [OK].
Log out.