A “Cancellation request” link can be found next to each order item in the order details (which you can reach via “My Account” under “My Orders”). You can use it to request a cancellation from the supplier. Whether or not a cancellation is possible depends on the supplier's General Terms of Business. In some cases, the cancellation is already deactivated in the system, e.g. if an item has already been shipped or if a specific timeframe has been exceeded. In this case, the “Cancellation request” button no longer appears in the order details.