You will do so on a device separate like a smart phone. If you already have one through either an email, Facebook, Steam, or via a Final Fantasy XI or Final Fantasy XIV account, you can sign in with those credentials. When you first boot up the game, the game will ask you to setup or sign in with your Square Enix account. You must have a Square Enix account connected to this game in order to play Multiplayer.
The first thing you'll need to do when you begin the game is create or login to your Square Enix account. How to Connect a Square Enix Account in Marvel's Avengers Start the mission and the game will begin to matchmake for you. If you wish to matchmake, make sure this is on. You should see underneath those slots a prompt that says to press Square/X to turn Matchmaking on or off. Outside of the hero roster menu, you’ll see your selected hero, your AI companions (if any), and whatever open slots you have on your strike team.
