You will notice that at the start of the game you will have some missions to complete. To the right of them, you will find the number of cups that each challenge will give you for your ranking. You will receive a new mission only when you complete one of these tasks.
Every time you complete a challenge you will have to go back to the "Missions" menu and, where you previously could see the amount of cups it would give you, you will now also have the possibility to collect them. Once you have collected them, that mission will disappear and will be replaced by a new one.
For more information about this game mode, we invite you to visit the following article: Missions.