Open the "Alerts" tab
The Alerts button appears to the left of the Menu button. On desktop, this will be in the upper right, on mobile, on the bottom right.
Click on the gear icon.
The gear icon will be in the upper right corner of the alerts/notifications window.
Adjust settings according to your preferences.
You may set the notification methods for your Global Preferences as well as specific notification events by opening the section and toggling the switch controls for the different methods on and off. The current methods are Email, In-App, and Push notifications.