Moonlight requires the host PC to meet NVIDIA's GameStream requirements as follows:

• Windows 7 or later
• NVIDIA GeForce GTX/RTX GPU 600-series or later (GT series GPUs are not supported)
• NVIDIA GeForce Experience

After you’ve confirmed the the system requirements, do the following:

1. Install the Moonlight app via Google Play.
   
2. When you open the app, it will start searching for PCs with GameStream running.
   
3. Install NVIDIA GeForce Experience on the PC and enable GameStream under Setting > Shield to allow your PC to stream games to SHIELD devices.
   
4. When connected to the PC, the Pairing prompt appears in the app.
   
5. On the PC, enter the code on the app.
   
6. After the connection finishes, you can see your games in Moonlight.

For more information please refer to Moonlight support.