Within Canvas you are able to add contact methods, a default email address, and receive SMS text messages. You may also need to remove an email. In order to so you will first need to add a new default address, and then you can simply select the trash can icon next to the email you no longer wish to have listed.
You can add communication methods to your account and receive notifications through text message, email, etc. For example, students can receive a text with their test scores, and faculty can receive an email when they have a new assignment submission to grade. Learn how to set your Canvas Notifications.