How KDE3 (KDM)default at boot?

FBSD 4.6
How do I setup KDE to start as default WM? I don't have .xinitrc, xserverrc. My X11 is empty.I'm stuck with FWM as default.
What file to I configure to make KDE 3 the default Window Manager?

If you wish that KDE becomes the default window manager for a user, make (or edit) a file named .xsession in the user's home directory. This file should looks like this :
#!/bin/sh
kde

Another way by looking at the file /etc/X11/xdm/Xsession, which selects the window manager at login if you pick one from the list, It checks to see what desktop is specified in a file called /etc/syscongfig/desktop. If /etc/syscongfig/desktop doesn't exist, it chooses Gnome by default unless the PREFERRED environment variable is set to KDE. To set to KDE as the default, then, all u had to do create the file /etc/syscongfig/desktop with "KDE" in it in capital letters, logout and re-login.