On your Mac, choose Apple menu  > System Settings, then click Siri & Spotlight in the sidebar.

Turn on Ask Siri (if not already on).

You must be connected to the internet to use Siri.

Turn on Listen for “Siri” or “Hey Siri,” then follow the onscreen instructions.

Choose any additional Siri settings, then close preferences.

For more information, see Use Siri on Mac in the macOS User Guide.