The AAAA Record points your hostname to an IPv6 address. The record AAAA specifies IP address (IPv6) for given host.
The AAAA record has the following look in your ClouDNS Control Panel:
How to add it?
Go to your Control Panel and click on “Add new record”. Type, as follow:
TTL: 1 Hour
Points to: ipv6:of:your:web::site