DomainName.com - How to push a domain to another account?

[Federer]

I have just sold a name registered over at DomainName.com

Does anyone know how to push a domain from one account to another (at DomainName.com)?

I have sent 2 emails to staff, tried calling - all with no results. I am sure the procedure is simple. Can anyone kindly help?

Thank you in advance.