Yahoo recently stated that this tool is still around until they replace it with a new one they are working on that they say is much better. They have indicated they hope to have the new one available later this year.
Yahoo also stated that the present tool is having response problem because of the large number of people wanting to use it and this is sometimes causing time outs and error pages.
Attention: "role based name" email prefixes such as support, webmaster, info, contact, forum, service, affiliate, admin, traffic, partners, marketing, etc., for our member accounts are not permitted. They are acceptable for a vendor listing, but not for the member email. This is due to bulk email processors scrubbing them for delivery due to extremely high bounce rates. Please apply for membership using a personalized email prefix. Something like email@example.com.
If we discover you signed up with a role based name we will give you only one message to change it. After 3 days your account will be removed if the email is not changed.