You can save your game progress by either linking your Facebook account and 

connecting your Google Play or Apple Game Center account.

※ Linking your Facebook account

Tap the Menu icon at the upper right corner of the screen to access the Game Settings, then select the Facebook Log-in button. 

The game will automatically restart and an option to link your Facebook account will appear. If you’re not logged in on Facebook, 

it will automatically send you to the Log In page. A message will appear to request game permissions for Extreme Football, 

press Confirm and your game progress will be linked to your Facebook account.

 (Needs to be verified in official build as it only gives an error in the test build.)