Lawnmower project

Lawnmover Project,

101 Question,
Iám familiar with the code Writing in somewhat.
but ;I got the monster moto shield and mp3 shield
from sparfun to run things from my Arduino mega card
what I dont know is the wiring. I am not gona stack them
but any way what goes where from the Aruino to the Shields?
Sparkfun advise me to go to forums to find out; wich I find a bit lame,
shoulndent they know they solderd the Tham thing, pardon my frech.
Any way please help me so I can get my Music playing robot lawnmover opertational :o

Best Regards to all you builders out there. Stefan.