The article outlines the steps to edit a shipment.(Please note that this action may be restricted due to your permissions if you require access please log a support ticket.)
FOLLOW STEPS BELOW:
1. Navigate to Shipments by clicking Product Stock->Shipments in the navigation pane.
2. Search for and open the shipment you would like to edit.
3. Change the shipment to an editable status.
4. Make any required changes.
NB. For a quick tutorial watch below