In Zedonk a Return Authorisation is created from a Delivery Note.
The Order Tracker is where you see all the documents related to a specific Sales Order.
CUSTOMER: Customer Primary Address.
SHIP FROM: Customer Delivery Address from the Delivery Note.
SHIP TO: 'Returns Ship To Address' set into Settings > Company Details
CONTACT INFORMATION: Customer contact from the Delivery Note.
SHIPPER and SHIPPING TERMS: Blank. For you to fill.
Complete any other missing information if you need it on the Return Authorisation.