How can I separate my SBC Small Business account from my '@prodigy.net' Yahoo ID account?

How can I separate my SBC Small Business account from my '@prodigy.net' Yahoo ID account?
I purchased an SBC Small business account so I could have my own domain. Problem is, I have to log into my '@prodigy.net' account to view the other email account. When I am on Yahoo mobile, it doesn't even show this link. How can I unmerge my account? Right now I use SBC Yahoo DSL. Thanks!