You can find this settings in a “Settings Common” window from “Welcome Menu” window.
Here you can see the tab “Notifications” at the top of a window.
Here you can see a toggle that can turn on/off the notification function in the game.
In the “Data” section you can see current notifications. You can add new ones if you want.
Here you can set a title for your notification, a time the player will see it after the latest game run, and a list of texts that the user will see. Every time the game chooses one of them randomly, you can set one or a couple of them.