To update the contact information of domain name for example "transferdomain.com" please follow the below steps
1. Please login your billing area at https://billing.apc.sg/clientarea.php
2. Go to "Domain" button and click on "My Domains".
3. Click on the "Down Arrow" button and select "Edit Contact Information".
4. In this page you can update your contact information such as domain account contact, email address and other information.