I am a beginner ... I would like to insert a check, that if pressed the notifications are removed, instead if it is pressed the notifications arrive
For now it is like this ... I would like to put a "check box" which is initially activated and shows the notifications, if instead I remove (even while the reader is running) the notifications are not seen
Hello David
You can do this using an Arrangement to layout your own Notification. The 'Host' Screen and the Notification Screen in this case are what we know as 'Virtual' Screens:
When we define virtual screens, we use one 'real' App Inventor Screen (most often Screen1). Screen-sized Vertical Arrangements on it are displayed/hidden as required - they are the Virtual Screens. This is generally a better approach for multi-screen Apps, they share data without having to "pass" it between screens and it also reduces code duplication, making the App more efficient and the code easier to follow if you have to return to it at a later date.
So, instead of separate "houses", virtual screens are "rooms" of the same "house".
Can you show me how I should go about the blocks? 
Well, basically you can do anything that suits your requirement. Here is an example to give you an idea:
VirtualNotifier.aia (2.5 KB)
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Thanks you