There are multiple threads and posts on this subject.
It depends on who your tv provider is and what you use to view tv. For example, some people have cable like Spectrum and others use streaming services, like Hulu Live or YouTube TV. They don't have access to SNY via their tv provider. With any of these, you most likely will have to stream the games using the Fox Sports app. To use this app you need a Smart TV or a streaming device like a Roku, Amazon Firestick, Xbox. In order to login to the Fox Sports app, you will need to have your local Fox programming and FS1 via your tv provider and use your tv provider credentials. Of course you will also need access to ESPN/ABC and CBSSN in order to get every game.
If you have DirecTV, they offer an add on Sports package that carries SNY.
I have an older Smart TV but stream the games on SNY using the Fox Sports app on either my Xbox, Roku or Firestick.
When we get closer to the games, there is a good chance that step by step instructions on this will be posted on the forum for reference purposes.