2 Name: *insertnamehere*!!mhJDjCwh : 2012-07-24 12:42 ID:jxS6rfWt [Del]
It's basically a password of your choosing after the exclamation mark.
So since your username is Hibiku, it'd be Hibiku!imsocool or something like that, I dunno what your password for other sites or something would be.