how do I boot Knoppix from Usb Cd-rom?

When I start to boot Knoppix the process go to stop because "can't find to filesystem".
There is a system to bypass?

I doubt you can as the boot image doesn't have USB driver in it as far as remember so it cannot see the CD-ROM. You need to make your own.

Can you say me how to do?
What I must change and where?
THANK YOU