There are a few steps here.. have not done it myself but looked it up.
Lets assume the answer is streaming.. that you have broadband internet to your home.. or even unlimited data in 4G LTE on your phone.. though that should be costly unless you go android with Google fi.. unlimited is $60 for data.. I think $20-$30 everything else. The real limit to streaming speeds at this price is 15GB.. then speed drops.
So, assuming you have internet speeds to stream, you then need a BTNplus subscription.. $79 a year.
https://www.btn2go.com/packages?type=0
Then you sign up for a BTNgo account.
You will then be able to browse to BTNgo to find your game and view it on a computer. There are apps for your phone/tablet to view it there.
Then you need away to view streaming content on your TV.
I have Google Chromecast ultra. It is a USB dongle you plug into a TV's USB port. From the chrome web browser it is very easy to "Cast" the contents of a tab, or my whole desktop, to the TV through the Chromecast Ultra.
Similar product is an Amazon Fire stick.
Other products might be a Roku streaming device. I know there is a native BTNplus app for the Roku. There are
many Roku products.. and some smart TVs have Roku inside. I think the $99 Roku ultra might be the thing for you if you know you will watch on a certain TV all the time.
The way you would watch is to use the TV remove to change the TV input to the HDMI port connected to the Roku device. Then you can use the Roku's remote to do everything.. find the BTN plus app and find your game and start streaming.
(switching channels is not as smooth.. you would switch INPUTS on the TV back to your regular TV tuner... then use the TV remote to find your channel.. then switch inputs back tot eh Roku device and hopefully, it will still be streaming your game.. I assume this was a switch for timeouts, commercials, etc)
But if you might watch in different places... well.. I guess you could unplug the Roku and move it. It is small. But that Roku device needs to be connected to the internet... either via wifi or hard wired. The same would be true for any device using a streaming solution. But if you will move from TV to TV.. perhaps streaming off your phone/computer/tablet.. connected to different Chromecast sticks or Fire sticks.. might be the answer. Some smart TVs can be "cast" to without a special device.. some samsungs for instance, might appear as a device you may "cast" to.
There are other streaming devices as well.. like Amazon Fire TV cube (and Prime Day is right around the corner.. can probably get deals if you are an amazon prime member).
Here's a link on how to watch BTN without cable