From: Andy Bradford email@example.com
You can apply the same to whatever WM you want but I will describe it only
Edit /opt/kde/share/config/kdmrc and add afterstep to the SessionTypes
Then edit /etc/X11/kdm/Xsession and add the following to the case
statement near the bottom. I added it after the case that begins kde)
That's it. Once you have saved those files and restarted X (in kdm)
then afterstep should show up in the drop down menu as the second item.
Make sure that the path is correct for your system.