To set your email notification preferences, click on the hamburger button (3 stacked lines) in the top left of the Annoto window.

Select Comments from the options and click the bell icon to follow a discussion.  If you follow a discussion, an email notification will be sent to you anytime a comment or reply is made on that video.

By default, anytime you comment in a video you will be sent email notifications when new comments are made to that video.  You can disable email notifications using the toggle switches located in the Preferences section of the Annoto window.