The option to create a Multiplayer match will be available from the following areas of the game: 

-Tap on "New Game" in the Home Lobby
-Tap on "Multiplayer at the bottom of the screen

After going to one of these areas, there are two different ways to start a Multiplayer match:

Random matches:

The game will automatically choose your 3 opponents for the match.
The game focuses on allowing you to play with your friends or other matched opponents through a matchmaking process. These players will generally align with your overall skill level in-game.

You may be paired with an auto-generated opponent if no suitable match is available.