You can manage both your "Joined Predictions" and "Created Predictions." There are two entry points for the management portal:
From the Prediction Introduction Page:
Follow the instructions on creating a new prediction. On the main Prediction page, tap the menu button in the top-righthand corner to access management options.
From the Prediction Discovery Page:
Access the management portal by tapping the menu button in the top-righthand corner of the Prediction Discover Page.
Joined Predictions
"Joined Predictions" displays all Predictions in which you have participated by voting.
Predictions are listed in reverse chronological order based on the time of participation. Revisit your voting history at any time to track these Predictions.
Created Predictions
"Created Predictions" allows you to manage all Predictions you've created.
Predictions are listed in reverse chronological order based on their creation time. Created Predictions have different Prediction statuses that come with specific management actions.
Details on different Prediction statuses can be found on the page Lifecycle of a Prediction.