Notifications:
To open the Notification Centre, swipe up from the middle of the Lock screen or swipe down from any other screen.
Tap and hold the notification you want to manage.
In the pop-up menu, you will see the following options: Done and Skip. Tap one of them depending on your intentions.
You can also manage your habits from the widget.
Make sure you add the app's widget to your device's home screen.
Swipe left over the Home screen and then scroll to the very bottom. Hold and tap on any existing widget, then tap on Edit > Add Widget.
Find "Productive" and tap on Add Widget. When finished, tap Done in the top right corner, and the widget will be successfully added.