1. Go to Incoming -> Archive -> All Offers and open the offer you want to cancel.
2. In the middle of the offer, you will find a button 'Open Cancellation Form'.
3. After clicking on 'Open Cancellation Form', a cancellation form opens.
4. After you fill in the form providing a reason for cancellation, submit the form in order to finalize the cancellation.
5. After cancelling the offer, you will able to view the offer under Incoming in Archive in the tab Cancelled Offers.