[newbie] How do I get out of X-Windows

[prontomail]

I know how about the Ctrl-Alt-Bksp part, but when I do that it only brings me back to the X-Windows (KDE) logon screen and not to the prompt. Even restarting the PC does not make it stop at the prompt. It goes straight to the KDE.   Also, how do I change my display resolution in X-Windows.   Thanks for all info