Find a player that is willing to join your team. Click their name and select the first red bar that reads "Invite". The receiving player will have the option of "Decline" "Block" or "Join". If they select join, a new tab beside World Chat will appear showing your team chat. You can have a maximum of three players per team. Now you have to option of battling another team or playing any Campaign module: To battle another team, your team leader must invite the other team's leader to a battle as you would if you were to play a casual game vs them. To play a Campaign module your team leader must enter the Campaign map and begin an adventure as they would if they were on their own, your teammates will receive an option of "Not Yet" or "Follow".