How to clear envelope icon badge in android app.

[CK1]

As the title, I'm using my (up to five devices) "Kaspersky Internet Security" on desktop/laptops phone etc however, on the android phone I have this notification badge as seen below:

 

Now, opening it its a message regarding stolen data however, upon reading the whole message there is no way to mark it as read or delete it, additionally backing out of the message does not clear its "1" mark either.  How do I clear this?