To access your HorseClass course library on a Smart TV, the television must have the Chrome application to access the internet.
However, if you don't have or aren't able to install a Chrome browser on your Smart TV, you can also plug your computer into the TV using an HDMI cord. Easily purchased at any store that sells electronics or online. Not all computers or laptops are equipped with a full sized HDMI port.
If it doesn't have an HDMI port you will need to purchase a converter, the most common solution to this would be an HDMI to USB converter. Your computer will need to have ports for the USB to use this option as well.
I hope this helps and offers a solution to being able to access the courses from your Smart TV!