[knc1]

You must be in USBMS (USB Mass Storage) mode.
I.E: Remove USB cable and toggle the device out of USB network mode to change that option.

Have you any experience at all with a Unix of Linux computer's file system?
Where in the file system tree are you trying to make changes?
That makes a difference.
Use the output of the
mount
command (just as written, no arguments) to get information on what parts of the file system tree are impossible to write to.

Then ask yourself: "Could this perhaps have been done for a very good reason?"

PS: What good would a link to one of our tutorials do for you?
You haven't even read the directions that are packaged with the USBnetworking package yet.
Hint: Use the drop down box to filter the index page by the prefix: Tutorial