In order to bid in www.artdiplomaticauctions.com you have to be registered as a user (buyer). The register is free. Click here and insert correctly your data in the boxes.
Once you are registered, you will receive a confirmation email to access the web as a user and then you can start to place your bids.
Now you only have to log in as a user (buyer). Then you can access to all the active auctions in the web, as well as the lots in Post-Auction Sale to can buy directly. You will have a pannel in the section My profile where you can control your bids and pay the awarded lots, download your invoices, etc.