You can check your notifications by clicking the bell icon in the upper right-hand corner of the page.
"Announcements" function
Just press the bell icon 
in the header to see a list of announcements.
Then press "×" to delete all the notifications.
PC, Tablet / Smartphone
The notifications are as follows:
- Latest updates
- Announcement of campaigns and other events
- Subscription-related announcements
- Other notices necessary for using the service