To add a new email notification, select File / New Notification / Email from the file menu. This will launch the new notification process.
Define the name you want your notification to display as, define the email address you wish to send the notification to, and check whether or not you want this notification to be enabled by default when you define a new resource.
On the bottom of the Email window, you can also click on the "Test" button to test sending an email to the defined address. This will allow you to confirm that the address defined is entered correctly.
On the right hand side, you can also click on "Custom Text" to customize the message sent when an alert goes out. You can define the subject and body of both "Notification on Failure" and "Notification on Recovery" messages.
When you are done defining your email address, click on "OK" to save.