ok, so i have my blu-ray where it can see my wdmycloud device, and i played a song successfully through it using the remote control of the blu-ray.
so my question is, how is MC going to control the blu-ray to tell it to start playing the song?
when you click play in the MC gui, i can see it being able to get the bits from the wdmycloud, but what will actually control the blu ray to make it start converting the bits through it's dac and playing the song?
and if it can, and it is that easy, what do i need to do once i download jriver after i import the song?
You need to read up on DLNA! Have a look through the MC Wiki and Media Network. As long as your BR player or your AV amp is a DLNA
renderer then MC will be able to control it. Assuming your device is networked properly it will automatically appear as a "zone" in MC which you can select as a destination (as opposed to playing music locally on your PC) and you can send music to it and control it from MC. It is exactly the same as the so-called Play To facility in Windows, or in the Apple world, Airplay.
Once downloaded you will need to enable Media Network in MC and enable DLNA Controller. If you are using your NAS as a DLNA server then there's nothing else to do except connect to the server from MC (Using Load Library), but if you want to use MC as the server then you need to enable DLNA server and import your media into MC.
Note that there is no guarantee that either your BR player or your amp can behave as a DLNA renderer. They've got DLNA but this might only mean, as you've found out, that you canonly control them from their own UIs and remote controls (that's called a DLNA Player). If they have Renderer functionality then it means they can be controlled from another device. You'll only know once you try!
anyway, i will start downloading MC now....I assume they have a free trial period?
Yes, there is a 30-day trial period.