Using Musescore with other things like digital piano and Bome midi translator

Hi, im very new to this and havent a clue why i cant get this problem solved.
Problem 1
I cant here my digital piano when Muscore is open as that software is using my audi driver. Ive gone to settings and made my piano as the out put but still cant hear anything.
what i would love to do is be able to listen to musescore then play it back on my piano with the sound coming from the comp just like it does with musescore.
i have purchased middi translator which should allow both piano and musescore to be heard but cant work out how to do it ?
ive looked at all instructions but im blown away ! can someone help Pleeeaaassseee !