From what I can see this is not a network enabled receiver and has no USB connection.
You could just connect the audio output from your laptop to the Phono inputs on the receiver but this is not that convenient.
So ideally you need to add a network streaming device to your amp (Apple TV, WDTV Live, etc.), which will then allow your PC to playback via the amp. Some steaming receivers support the direct connection of an external hard disk so this is the cheap option.