If you don't want to hide the owner of a domain any longer, you can disable the whois privacy with the following steps:
1. Open your customer area and click on the menu point "domainlist"
2. Choose the action "update" right to the domain
3. Your domain is now in the shopping cart
4. Disable the whois privacy, by removing the tick from the checkbox in the shopping cart
5. Execute the order
Please note: If you cancel the whois privacy before the planned expiry, a refund is not possible. If you re-order the whois privacy, it must be payed again.