Parents can visit go.schoolmessenger.ca or they can download the school messenger parent App to their smartphone (blue in colour in the App store). When you create your account you need to use the email address that you have in the Parent 1 or 2 email field in Powerschool. Once you have everything setup you can go into preferences and manage how you want to receive messages. Messages and notifications are also sent directly to the App. Below are screenshots of what you should see from both the Web Portal and App (IOS view, Android should be similar).
Web Portal View: