Canceling a domain means you completely give up ownership of the domain and can take up to 35 days before it will become available to register somewhere. If you would like to completely cancel your ownership of the domain name, please reply to confirm.
We are only able to offer a refund if we receive notification within 48 hours of the purchase. For full details, please see:
http://en.support.wordpress.com/domain-mapping/cancel-domain/
If you would like to transfer the domain to another registrar, you can use these steps:
http://en.support.wordpress.com/domain-mapping/domain-management/#transfer-to-another-registrar