There are number of way that you can view the online service to your TV:
Video cable from smartphone or computer: You can connect your smartphone or laptop to your TV via a video cable (i.e. HDMI cable). Some laptops may not have a HDMI port and would require a video adapter from a different connector e.g. USB-C, DisplayPort, VGA/D-SUB (add pictures). The same applies for smartphones, they will require an adapter (e.g. Lightning to HDMI adapter for iPhone/iPad). This is usually the best option because it will provide the most reliable connection with the least ‘lag’.
Chromecast with Android: If you have a Google Chromecast device and an Android phone, you can cast your Android phone screen to your Chromecast (connected to your TV). This can drain your phone battery quickly and requires a decent Wi-Fi connection to your home router.
Chromecast with a laptop: If you have Google Chrome on your laptop, and a Google Chromecast device, you can you cast the tab to your TV.
Apple TV with iOS or Mac: You can AirPlay your Mac or iOS device to mirror your phone screen to your Apple TV. You will have to load the stream on your device.
Follow these instructions: https://support.apple.com/en-us/HT204289