Changing from Gnome to Kde4

Can someone explain or direct me to some documentation that explains how to change from Gnome to KDE4. I installed KDE4 but have no idea how to do the rest.

If you’ve installed the KDE4 pattern(s). All you need to do is log out of GNOME, at the login/display manager you’ll see something called session type - if your KDE4 installation is correct, you’ll be able to select to log into a KDE4 session there.

Enjoy. And keep in mind that KDE4.0 is only early adopters. And even 4.1.x is still just the humble beginnings of the KDE4 era.

I changed to KDE, Thanks.
Now when I try to activate the desk cube… it says check my xconfuration. Any ideas?