In ,
msnews.microsoft.com had this to say:

My reply is at the bottom of your sent message:

Does anyone know how to delete and redo a webmail address that has
been registered already. I made a mistake in the registration in
Yahoo. I wanted an address that has only @yahoo.com but mine came out
@yahoo.com.ph I tried to register again but it seems it won't accept
the login name that I originally registered. How can I remove the .ph
at the end? The only thing I can think of is to cancel the
registration but I don't know if there is such a command. Does
anyone know? Thanks.

Well this isn't Yahoo and, unless you paid for it, likely isn't an OE
question. Oh, and it probably violates their terms of service.

Anyhow, you can probably clear your cookies out, go to Yahoo.com, and use a
U.S. address to create your account. A careful look at their TOS might be in
order.

--
Galen - MS MVP - Windows (Shell/User & IE)
http://dts-l.org/
http://kgiii.info/

"At present I am, as you know, fairly busy, but I propose to devote my
declining years to the composition of a textbook which shall focus the
whole art of detection into one volume." - Sherlock Holmes