Making a carded, or failed, delivery is easy in the mydelman Android app
When you have completed the Failed delivery information page, you are returned to the Delivering Items page, and the failed delivery will be cleared from the list.
The latitude and longitude where you completed the Failed delivery information is recorded in the mydelman Android app, as evidence to the receiver that you did attempt delivery at their address, so it is important to complete this information while at the receiver's delivery location.