I normally don't respond to step-by-step requests, especially when the documentation seems clear but I'm in a good mood today.
1. Get the orinoco_cs source code at
http://ozlabs.org/people/dgibson/dldwd/
2. Unzip it. tar zxvf orinoco-0.13e.tar.gz
3. Change to the directory you just created. cd orinoco-0.13e
4. Review the instructions. less README.orinoco
5. Copy the patch to the current directory. cp /pathtothepatchfile/orinoco-0.13e-dragorn-patch.diff .
6. Apply the patch. patch -p1 < orinoco-0.13e-dragorn-patch.diff
7. Compile and install the patch. make && make install
8. Restart PCMCIA services. /etc/init.d/pcmcia restart or /etc/rc.d.rc.pcmcia restart depending on your distro
9. Run Kismet and smile.
Alternatively, just grab 0.15RC2 of the orinoco_cs driver. No patching needed. Same instructions except omit 5 & 6.