Push Notifications - How to send?

Hello, I need to send a push notification to a user, but I don’t know how to send it. I’ve seen the tutorial, but it seems confusing to me. When creating the permission column, all users already appear as permitted. However, where do I send the notification? Literally how do I send the notification to the user since the permission is already granted?

Hello, I need to send a push notification to a user, but I don’t know how to send it. I’ve seen the tutorial, but it seems confusing to me. When creating the permission column, all users already appear as permitted. However, where do I send the notification? Literally how do I send the notification to the user since the permission is already granted?