Siprotec 5 BCU communication with WinCC HMI without RTU

Hello,

I am trying to get a 6MD85 BCU to communicate with a WinCC HMI (using my laptop). The BCU is connected with optical fibre to a ruggedcom switch, and from there with a lan cable to my laptop. Im unsure how to get the signals from the BCU to the HMI. I have made an SCD file in DIGSI 5, but unsure how to use it in WinCC. Any help is appreciated.