Notifications are currently not enabled.
Notifications can help you not miss important announcements in tournaments you play.
At the moment, notifications are desktop only (so not on mobile devices) and available from your dashboard. If you have notifications enabled and an open dashboard (it does not need to be focused, you can do anything you want on your device), your browser will send a notification to your device every time a new round starts.
To disable notifications check your browser's documentation, they all have their individual notification settings.