lost account.

hello, sorry for having this here but i don know where to report this thing. i`m a player from molten wow.. i remembered merging the account and changing its password after molten wow was gone and i`m wondering why i couldn't log it in now.. it says invalid username/password when i try to log it in. i think its been months or a year that i didn`t open it after merging. can i still get it back? i was wondering if i could get it back, cause even though the chars was gone, it was a premium account back then... my friend got his premium account after molten wow so i was wondering if i could get mine too..