How do I set upi to paly media from my PC?

Sorry that this is such a numpty question but how do I setup Firecore to play media from my PC not through iTunes.

 

I’m confused by

“Workgroup” (I thought this was the network Workgroup name I’ve set up in Windows),

“Server name” Is there something else I need to donwload?

 

Thanks for being patient.

 

Steve.