In your interface BlitzIn there is a window with a black background. It has a blue bar above it with the title 'Main Console'. In the black field you can read all kinds of communications on ICC. Underneath the black field is a white bar where you can type ICC commands.
Can't find your Main Console? Menu above: Window > 1. Main Console
"help commands" gives a list of most of the commands.
CLICK HERE for more details on how to use these commands.