http://add.yahoo.com/fast/help/hkc/knowledge/cgi_feedback
You can write your email here.
2007-02-04 11:33:16 補充:
After you login to your account, go by the following link: 知識+ > 服務指南 > 常見問題 > 客戶服務Then click on "Yahoo! 客戶服務", it automatic give you a form to fill in. Hope this help.