Apps that opt you in automatically to notifications are annoying, apps that don't allow you to opt-out or turn it off in the app are terrible. I have spent the past couple of minutes trying to find an option to disable notifications from inside the app and there are none. I did a quick web search and I have not found any information on it yet. I know I can turn it off at the Android system level, but this should not be expected. If it is in the app, then the UI needs work as it is not intuitive.