Easiest way is with a program called PuTTy.
You could use the SSH Terminal in Plesk, but its java-based, and I personally find it to be ****.
You will log in with your admin username and password (the same one you use to log into Plesk), on port 22, unless you did the smart thing and moved SSH to a different port for security reasons, in which case you would use that port instead.
You'll be using the admin login because, for security reasons, you should have already by now disabled direct root login access.
Unpack the files. Upload them somewhere (I suggest not using a web-accessable directory). Edit the sc_serv.conf file. Type this into the terminal:
./sc_serv sc_serv.conf &
The & will send the process into the background, and allow it to survive logout (means it will keep running after you close the SSH window).
If it is running happy, and you have sent a test broadcast and connected successfully, simply type "logout" and you're done. Shoutcast is running.