Notification list's are who the SMS and/or Email messages are sent to. You can create multiple notification list's.
To create a notification list, hover over the "server monitoring" tab on the tool bar and then click on notification lists. Click on new.
The first step is to name it. You can name it whatever. In this example, we will call it default.
The last step is to add the users you have already created to the list that you want to be on it.