What's the model number on that NIC? I'm gonna try Googling it to figure out the appropriate project for you to use... The linux-wlan project would be a good bet, since most USB wlan NICs use the Prism2x chipset, but I don't know for sure. I'd recommend that first, at www.linux-wlan.com.
The README enclosed gives a pretty good rundown, but on RH 9 you will probably need to add your DNS servers to /etc/resolv.con and run route add default gw <whatever> when you're done activating it.