To sign up, go to NPC Tobby and do the dialogue:
'hi, subscribe, yes'
After subscribing, you need to create your team:
'hi, create team, yes, name of the team'
If Tournament is in teams, you should invite your partners:
'hi, invite, name of the player'
To accept an invitation from another player:
'hi, accept, name of the leader'
Other dialogues that can be used in NPC Tobby:
'info', 'statistics', 'leave team', 'kick' and 'see invites'.