Jane, I hate to be the voice of pessimism, but good luck!
In my book, Yahoo! is the worst offender of making customer service and CRM oxymoron's of today's age.
As a matter of fact, they were recently in a "top ten" of sorts at PC World magazine regarding this very subject.
However, you may have an easier time getting info out of Overture:
For the UK
http://www.content.overture.com/d/UK.../contact.jhtml
For the US you can try 1.866.924.6676