To enable or disable notifications, please follow the instructions below:
Go to the 'Wallets' screen and tap the Settings cog in the top right of the screen.
Tap on "Notifications".
You will now be presented with the notification options; green is on, grey/white is off.
If you enable push notifications, you will also be able to add a notification to alert you when a transaction you have received or sent receives a confirmation on the blockchain.
You can also enable or disable email notifications in a similar manner.