2. This is the screen you see once you select the Unsubscribe button from step 1. This is just giving you an option to rejoin if you want and that is all. It has nothing to with you unsubscribing. Go check the email of the address you used to unsubscribe from step 1 this is where you will see the Confirm button.
Unsubscribe is found at this link https://ostabusplanner.ottawaschoolbus.ca/Subscriptions/Unsubscribe.aspx