Search this site for WUSB12. You'll find some hints.
Also go to file /usr/share/doc/linux-wlan-ng/README.Debian.gz.
This will explain the settings for the network interfaces file.
Mind you, this driver only works for version 2.5 of the Prism chip.
Some newer Linksys USB adapters use a different chip.
But I managed to get my WUSB12 working using these instructions.
The WUSB11 also uses the Prism 2.5 chips and same drivers, I've read.

Unfortunately, I had to do a hard drive install to make these changes.
When I tried to edit the files indicated in the instructions, I could not
do so on the CD. But I'm new at this too, so maybe you'll figure
out how to do that. I wanted a hard drive Debian install anyway.