about window mamager

[FLYING LI]

I installed KDE,window maker ,fvwm and afterstep when
I install the system .and I set KDE as default window
manager.Now i can enter KDE normally.but when i exit
KDE  and try to run wmaker,fvwm & afterstep,there is
only an error "can not open display"" ".I think that
the window manager have not been configured rightly.
but i can not confirm the path of config file and do
not know how to config them.would you please to help
me? 
thank you!

__________________________________________________
Do you Yahoo!?
Yahoo! Tax Center - File online, calculators, forms, and more
http://tax.yahoo.com