Where should I be selecting the electronic cal kit model in the vector network analyzer software?

Due to all the automation that is part of the electronic calibration procedure, the user is not required to select a kit in the VNA user interface because it is done for them. The software will recognize the module and provide comparable options in the software UI. The user simply needs to define which calibration option they wish to perform: 1-port, 2-port, 3-port, or 4-port. They will then only need to determine which are the ports of interest they want to calibrate:
 

 
The electronic calibration routine performs automatic sensing to determine which VNA ports are connected to which ECal module ports then performs the calibration, capturing any and all error correction coefficients for the different port combinations.