Get an account on a laptop and log in
Copy the template c program to your directory:
cp /usr/local/ic/libs/template.c .
run emacs or vi (some text editor), load template.c, insert your own program in the area marked out, and save it under a different name.
run IC:
ic
load your program:
load program.c
Run it by typing main() at the IC prompt or by power cycling the board.