reset password: username too short

[ddy]

I try to reset the password of my old account (I played in 2006) on that page http://www.dragon-network.net/account/reset_password.php

but I have the message "Username must be between 4 and 14 characters. Be sure that it doesn't contain invalid characters." because my account is "ddy"

can someone help me, because I can't login in game ?

(I reset the forum password with no problem; is there a link between forum and game login/passwd ?)