At the Rave website above, if you Add a mobile number to the first section, you can receive text message alerts and notifications in case of emergencies. If you Add a Line contact phone number in the second section, you can receive calls with notifications to the number you add. If you Add an Email, in the third section, you'll receive alerts to the email you provide. By default, your Massart Gmail account is added, but you can add more.
The symbol below the Add button allows you to Edit the number of email you have added. You can remove any of these numbers and email accounts aside from your Massart Gmail by clicking on the red minus sign next to the edit symbol.
When adding a phone number, you need to verify it first. Rave will text or call you with a code that you need to enter into the website, which will verify the number, and allow that number to receive texts and calls. Messaging and data rates apply as though they were a regular text. You will know whether or not your number is confirmed by the Confirmed notification next to the number, and you can test this number at any time by clicking Test.