You will need to confirm your ID with a credit 
card. You should be able to find all the 
instructions and information you need at my Yahoo 
Japan Information page. Use the URL above, or 
this one here:

http://people.ne.mediaone.net/raiser/drac/YahooInf
o.html

Pay special attention to the registering with a 
credit card link. . .  And feel free to write me 
with any additional questions. ^_^

Many Sharp Smiles,
--Drac