Facetune App notification issue?

So I have this app on the iphone. In the little red bubble on the app it has the number 8. How do I get rid of this. I hate when I have notifications.

There's a mailbox in the app with some cool tutorials.
You can click on the small bubble coming out from the facetune logo on the main app screen to access them and once you open them the bubble will disappear

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