To manage notifications on iOS:
Select the “Profile” icon in the bottom right-hand corner of the app.
Tap the gear icon in the top right-hand corner of the screen to access your settings.
From here you'll be able to go to your “Notifications” section to manage your mobile and email notification preferences. If the mail or mobile icon for a certain category is green, that means that you have notifications turned on.
To manage notifications on Android:
Tap the menu icon in the top left-hand corner of the app.
Select “Settings” and then “Notifications”.
From here you’ll be able to manage your mobile and email notification preferences. If the email or mobile icon for a certain category is green, that means that you have notifications turned on.
Check out this article for how to manage your notifications from a web browser.