Try temporarily setting a password and then it should be there to enter. The wiki mentions how to do this. I don't know whether then passwords file is stored in the ramdisk or not, but if it is you should be ok and be able to use the password you enter for the duration of your session, then you could on the command line type savconfig and be walked through what to do to save your settings (not on an NTFS drive or partition). At boot you would type knoppix myconfig=scan to reload them. Hopefully this will be of help, I will try this on my own live cd by tonight to confirm for you, I'm using accelerated knoppix which is based on 4.02 and should still work the same.