To turn on the notifications, you must have the smartwatch connected to a smartphone through the App Cubitt JR + Teens
Here is the link to download the App for iOS for Cubitt JR + Teens:
https://apps.apple.com/us/app/cubitt-jr-teens/id1633729778
Here is the link to download the App for Google Play forCubitt JR + Teens:
https://play.google.com/store/apps/details?id=com.hinteen.cubitt&hl=en_US&gl=US
Once the watch is connected, you can go to the option in the App that says "Message push" and here you will be able to select the Apps you wish to receive notifications on the watch
Remember the notifications/messages you receive on the watch are the same messages you will receive in the smartphone you use