No KDM login, no user, no security etc.

I have installed the Knoppix 5.3.1 on my Dell D600. KDM is installed (I checked), but when Knoppix boots, it doesn't give me a user login (I added a user) and when I go to a terminal it says

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knoppix@Knoppix$

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, so when I su, I get

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root@Knoppix:/home/knoppix#

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without having to give a password. How do I get rid of the defaults for the live DVD, so I can have a bit of security? This is a laptop which I intend to use on vacations and business trips, so when I hook up to wireless, it would be wide open to the public if it's default . Thanks

There seems to be no responses to a lot of questions, so I'm guessing that this forum is not active .... thanks

i just missed you, i and a few others are active, sudo passwd root should work.