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 external display by connecting the TV with a computer.
Directions to how to share screen from you computer you can find here.