help me about simulation RCS with HFSS v9.0

Good morning ;

I am a student, I work with HFSS v9.0, my problem is how I can simulate radar cross section (RCS) with HFSS v9.0 ? I want know the full steps that I must fellow to simulate RCS of any model ( box, sphere, circle,cylindre,....) , if you have examples of projects please transmit it to me (*.pdf, project.hfss,.... ).

thanks.

Email :El_bouni@yahoo.fr