If Android Smart-TV has the Google Play Store -app feature:
Open Google Play Store app on the Android TV
Search Singa, install and open the app
Choose Log in - after that, you will get an activation code
Go to the activation page with a mobile device or computer singa.com/device, log in (or sign in as a new user), and enter the activation code
If the Android TV doesn't have the Play Store app feature, you can use the smart TV as an external display by connecting the TV to a computer.
Directions on how to share screen from your computer can be found here.