Home Theater Questions? Ask a Technician for Answers ASAP
Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
James, your denon model is "airplay" compatible, so as long as it is plugged into your router with an ethernet cable and properly established on the network, the computer should see it, and from your itunes program, at the top right you'll see the airplay icon, click that, then choose the Denon from the air play options list, and the mac will stream to the denon.
Do you need more help with this, James?