Head over to https://lichess.org/team/lichess-number-of-people-record-team and hit the big green 'join' button !
Go to https://lichess.org/team/lichess-number-of-people-record-team/tournaments and pick which one you'd like to play in
Team Battles are where 2 or more different Teams on Lichess.org play an event where players from each team are paired vs somebody from the other teams. The team with the most points at the end is crowned the winner. Arena is an event which is held only within our club and there is a certain allocated time for an event, the person with the most points at the end of the event is the winner. Swiss is where each person plays the same number of games and there is an allocated number of rounds.
See - https://lichess.org/tournament/help?system=arena , https://lichess.org/swiss