minno

I am trying to install my CNUSB-611 so I can add my Linux-computer to my WLAN. The distro is Mandrake 9.1. I am following this manual. The first problem I got was B.1. I doesn`t have the /usr/src/linux directory. Anyone know what to do? And what am I supposed to do at E (I`m a newbie)? I have read about something about a program called autonet, am I supposed to use it? Here`s a picture of the USB-adapter, if it helps (don`t think so ;( ) Sorry for my bad english.