This would depend on the one who's reffing you, but you most likely will be contacted to join the multiplayer room.
The rooms do have a fixed name: IGZST[player A - player B] (see rules). So it is very easy for you to find your match yourself should you not receive an invite.
The rooms do have a fixed name: IGZST[player A - player B] (see rules). So it is very easy for you to find your match yourself should you not receive an invite.