Two things you got to do:
1. Make an account with easports.com. There is an extra step in that process where you join your account with your gamertag. I did this so long ago that I forgot the exact steps. Google it.
2. Search for the NHL 13 app in the Apple App Store.
What you can do:
1. Look at standings and stats
2. Submit trade offers and submit offers for free agents.
3. See injury report and upcoming schedule of games.