If you are logging in for the first time, you should click on the message that appears just below the top bar to confirm whether you would prefer to receive notifications via email or SMS.
You will see a screen as shown below where you will make your choice.
All notifications that the school sends to parents will be visible on their computer or mobile phone screens if they login to the application. Additionally, the notifications will either reach them via email or SMS based on the choice they made here.