How can I install app DAZN on my Apple rv?

Model A1427 is an Apple TV (3rd generation). It doesn’t have an App Store or other ways to install apps. You can still stream DAZN through AirPlay from an iOS device.

How to watch DAZN on Apple TV - DAZN Support

“To get the best experience watching DAZN on your Apple TV make sure to install the DAZN app. This is possible for all users on an Apple TV 4th generation [or later]. If you are using an older Apple TV you can still enjoy DAZN on your television. Simply use the AirPlay feature to broadcast to our Apple TV. ”

appletv 3g does not support client side apps, apples central server choose what channels are available so you cant add any