Lost login to ww.wp.xz.cn

Did not see this topic in search–WP.org tells me that my email is already in use, but requests my username in order to send me a password. I don’t remember my user name. I had to log in again with a different email to get a new registration. Why won’t the site send a notice to that email?

Suppose it’s too late to do me any good now.

thx