Canon LBP7210Cdn Manual page 592

When starting the Remote UI directly from a web browser
"Remote UI"
Log in as Administrator.
(1) Enter a password in [Administrator Password].
(2) Click [Log In].
NOTE
If the administrator password is not set
It is not required to enter any value in [Administrator Password].
"Setting and Changing the Administrator Password"
Select [Network] from the [Device Manager] menu.