It says:
"Or, stream music from iTunes to your AirPort Express or AirPlay-enabled speakers."
The link I posted:
If you don't see the AirPlay icon in iTunes
When an AirPlay-enabled device is available, you'll see
to the right of the volume slider in iTunes. If you don't see the icon, follow these steps:
- Check that you have the latest version of iTunes and Apple TV software.
- Connect your computer and your other device to the same Wi-Fi network. If you're using Ethernet, connect both devices to the same router or hub. If you're using both Wi-Fi and Ethernet, connect your AirPlay device to the same router that your computer uses for Wi-Fi.
- Restart your computer, AirPlay device, and network router.
- Some AirPlay devices include an on/off option for AirPlay. Look for the option in Settings and make sure the feature is on. For more information, check the device's user guide.
- Make sure that your Mac or PC can communicate using port 3689, which is used by AirPlay to communicate with other devices on your network.
For information about the ports issue: Test TCP port connectivity for Apple software - Apple Support
All the above information is in the link I posted earlier.
Presumably you also have the manual for the speakers and can see what it says there. I spent 5 minutes researching this on the web for you and those speakers are pretty obscure with almost no online mention (by the way, they are not "Nakamichi Dragon" which has not been produced since 1993, they are "Nakamichi Dragon Lily"). From what I can tell they are Airplay enabled which means it should be pretty automatic unless another service is tying up or blocking the ports it needs to use.