If accessing through the app, you can always go to your order history and initiate a cancellation there. These are only possible if your items haven't been shipped yet. If they're already on their way, you'll need to wait for them to arrive and then send them back, applying for a refund. As for Buy Online Pick Up In-Store, cancellations can be arranged with the help of customer care. Simply phone 1-866-983-8582 and explain your situation.