The majority of our users are high school teams, so to prevent the creation of duplicate teams we eliminated the ability to create new teams for high schools. If you send firstname.lastname@example.org your team name we can add them to our database.
If you are a club/tournament user. In the mobile App, go to the teams tab and tap Find in the top right. In the next screen, there will be a red tab that says Create a Team.
You can replicate these steps to create all of your opponents as well.