Adding Parameter StaadPro Connect Ed.

I am trying to add parameters using the Graphical input screen, but it does not seem to work.
I am in the Analytical Model - Design Screen.
I select the "Parameter" Command, and then select "Define Parameters". 
In the Parameter window, after entering the parameter and value (UNB or UNT in this case), I select "Add", but nothing happens.
Instead, I must enter the Command File and type in the information which causes delays and defeats the purpose of having a GUI.
Please advise.