There are three types of contests in Season Challenge:
Tournament Contest: The ultimate challenge. One team for the entire season. Have what it takes?
Round Contests: A new Round Contest will be created for every round.
Private Contests: Create Private Contests and compete with friends. Give it a shot!
You will automatically be entered into the Tournament Contest and every Round Contest once you create your team.
Remember, you can view your ranking for a particular contest on the Contest Card in the Leaderboards section itself.