Normally, you can search or scroll through a list of players and favorite them, so that you can get alerts for your favorites. I can't find this option in the app. You can browse through the schedule and by clicking on a name, you can favorite a player. It works, but isn't very practical.
It could be that this has been changed in the last update (although that isn't announced). I can't install this update, because it's too big and I haven't got enough space.
UPDATE: it was indeed in the update, so with it you can pick your favorites in the usual way.
