How can I log on CentraSite Control?

Hello all,
I try to study and use CentraSite Control these days. After reading the official document, I log on CentraSite Control with the predefined user as the document said,( name:DefaultUser,password :PwdFor_CS21), but I can’t log on either.
The logon message says “make sure the name and password is correct.”. How can I log on CentraSite Control? Is there anything I have loose?
Hope your help, thank you.

                                                                                    Bill