I create an accont named : Manolofk on november 2010 and i changed my nick, how can i recover my stuff without i can't register with the nick : Milk?
Also the accont still with my actuall user card, same rank, QI and achievment full plasma:

Jalis did the name change.

Milk is an old user which is why you can't register as him.
Post here saying that you had gotten a namechange to Milk and it'll be dealt with.