Media Player setup

There’s a thread on this already but he apparently figured it out.

 

I’m no stranger to serving media across my network but Media Player has me stumped.  I can see my computer in AppleTV Black and connect to it but the only thing it shows is my Dropbox folder.  I have Twonky media server running and Plex is going great guns.  How do I make it so Media Player can see my shares?