You can contact a seller directly by clicking on the inquire about lot button located on the top right corner of any lot page.
You can contact sellers about liquidation events, by clicking on the contact seller button under liquidation information.
You can also contact sellers from the auction template, click on contact information and you will find the sellers.
You can retrieve any return messages from sellers by visiting the Aucto messaging center. Access the messaging center by clicking on the envelope icon on the top right corner of any Aucto page. You will also be able to review your full message history with all sellers here.