Signed-in users can also find this guide, with screenshots, under Help in the app.
The bell in the top bar collects in-app notifications for you. A red number on the bell shows how many you have not read yet.
Select the bell at the top right, next to your initials. The Notifications list opens.
Unread notifications have a tinted background. Each shows a title, a short description and the date and time.
Select a notification to mark it read and open the page it is about.
To clear the red number without opening each one, select Mark all read.