installed 11.10 and want to change IP address on LAN

[Tom Poe]

I have simple question, but dialog for network is confusing.  I want to 
change IP 192.168.1.133 to IP 192.168.1.66.  When I went looking for 
editing eth0, I got a bunch of Windows type dialogs, leaving me 
confused.  What is simple command I can enter in terminal to do this.

I replaced a desktop on my LAN, and want to share files through ssh.  I 
installed ssh server and client, and can ping, but cannot use scp to 
access, until I change IP on the replacement computer.
Thanks, Tom