To cancel an event registration, click the “my events” link in the navigational menu on the left-hand side of the platform. This will open the My Events section of the website. Scroll to the event in which you want to de-register. Click the "registered" button.
This will open up the specific registration for the event. Scroll down to the section that lists “Previous Purchases” (also applicable for free events that you registered for). Click the “Cancel and refund…” button. You will be prompted to confirm that you do indeed want to make the cancellation.
You will see a message that the registration (the order) has been cancelled.
If you change your mind, you can always re-register if there are spots left before the event.