This article explains how to create Email and SMS lists to use as a Notifications Destination.
Open Destinations and select the email icon from the available Destination Type.
Enter a name for the Email list into the Destination List Name text box
Select Who can use the Destination (Default is Anyone in your account)
Select the users from your list.
Please note the User list will only include users from your Organisation
Open Destinations and select the SMS icon from the available Destination Type.
Enter a name for the SMS list into the Destination List Name text box