To setup a notification go to Intelligence, Event Notifications
Enter a name and description for the notification.
You will need to create a segment which represents the audience of your notification, such as new users. Then decide on the type of notification to receive, either a notification for every user that meets the criteria or an account notification, in which you would receive a single notification for all users under that account.
Then configure the delivery method (currently email and/or Slack)
Now create your trigger for the notification. In this example a notification will be triggered by a user responding 0 - 6 (detractor) on an NPS survey.
Here is an example of a notification delivered via email