You can add opponents directly whilst creating a game, or in the team settings > opponents.
Start by going to your Schedule
Create a new activity and select Game:
Select Opponent:
4. Choose from the list of existing opponents if you have them, or add a new opponent.
5. The opponents name is automatically added to the game title
Adding and Editing Opponents:
You can add or edit a new opponent by following the steps above, or adding them directly in the team settings > opponents. If you have already played the opponent once, they will be saved in your Opponent list for you to choose them if you meet again.
To delete an opponent from you list of saved opponenets, go to Team > Settings > Opponents. Press Opponent name > 3 buttons in the top right > delete opponent.