Hi I'm Professor Soheil Sayyed Hosseini To solve the problem see my article on this issue of my control, ees which is published by the University of Rochester. If it is acceptable, say I wish you well.
EES is a software that allows calculations in a very intuitive way. The help you find in the menu is enough to do the analysis. You just have to transform the equations you use in your model, into the preprogrammed functions that are already included in the library. If you have any question, feel free to send me a message.