How can I cancel the order as a seller?

Provided the order is not marked as “completed”, you can cancel an order at any time. You do not need your client's approval to do so. 

In general, the cancel button is located here. If not, it means an action is required from your buyer before you can cancel the order. 

🚨Warning: Cancelations will result in a lower order acceptance rate or completion rate. Please read this question for more information.