To get S-parameters using HFSS

Dear all,
I am a very new user of HFSS. I want to get the S-parameter of a multi-conductor transmission line structure. I don't know what kind of excitations and boundaries to assign in HFSS. Could anyone help me with that?
Thanks a lot!

In the external ports use waveport, in the internal ports (ports on the microstrip) use lumped ports. Add a solution setup to your analysis and then make a validation check. Finally select analyze all and then open results and select what kind of a data or polt you want to get.