[David Pozzi]

first, be sure you downloaded the "full vehicle" version.

Look under "Help" on the right, then one of the selections is something like "Advanced" or "Full" That will allow you to run rear suspensions. Then on the main window to the right of the animation, there will appear a button for Front and one for Rear.

Look at some of the examples the program comes with. Load one that has front and rear data and then modify that file with your dimensions.
My full version doesn't have a torque arm option however.
David