After opening the app, follow these instructions.
1. Connect to your Google Home using bluetooth.
2. Once connected begin the process to connect to Wi-Fi.
3. After you pick the room you are installing the Google Home in and select a Wi-Fi network, press the three vertical dots in the upper right corner of the screen while the Google Home is searching for the network. An option to view your MAC address should appear, and after pressing that the app should display the address.
Once you've located the hardware address for your device, you can register it following the instructions for Connecting your streaming media player.
After registering the device on the network, resume the setup via the app.