playing score to yamaha keyboard

If this has been dealt with please point me to the relavent forum

I have installed MuseScore on Windows XP and I can
use a Yamaha keyboard ( with usb midi connection )
to enter notes/write notes/make the funny dots on the lines
( you can see I'm a great musician ) but I haven't
worked out how to get MuseScore to play it back to
the keyboard

Is there a guide somewhere

Ta

M