One way to do this from an app on your TV:
1. Download ESPN App to your TV
2. Open ESPN App
3. Go to settings in the app and then TV provider info and login using your login and password for YouTubeTV, Spectrum, Hulu, Dish, DirecTV or whatever by following those instructions
4. Once TV provider info has been validated, go back to home screen of the app and find game in Live & Upcoming
5. Click on game
6. You might be presented with a screen that has multiple options for watching the game. Choose the one the mentions SEC+ (NOT ESPN+)
7. If you are asked to sign up for ESPN+ at this point, go back and look for the game that mentions SEC+
8. You MIGHT have to do instructions 5-7 closer to game time such as 5-10 minutes before
You could also do similar instructions using your phone or tablet (with WatchESPN App) or a computer in a browser from:
https://www.espn.com/watch/
Once the game is playing on your phone, tablet or computer, you can cast it to your TV if the TV and phone, etc. are connected to the same Wifi Network
Beyond that, look for the game on YouTube and watch a sub-standard broadcast where people may be talking over the action or the picture is shaky.
Last resort - listen to the game on the radio.