If you are a member of a community or club, you should ask your club’s administration if they will be participating and, if so, who is in charge of putting teams together.  You can also form your own team if you have a network of similar skill level friends who would be interested in enjoying team-based pickleball.  In this case you would simply register your team when registration opens for a particular season.  If you’re not able to pull a team together and/or your club is not involved, a Player Seeking a Team form is on the APPL website which you can fill out to let captains know you are interested in joining a team.