How Can I Change My Id Account Name

Well in most established online poker players eyes(as well as my own) this is a form of cheating.  Players gather information about your style of play that they can use to their advantage the next time they see you at their table.  So, changing your username would give you an unfair advantage over an opponent you recognize.  You know their play style but they know nothing about you is a good way to sum it up.  Thus, you cannot change your username because you are given an unfair advantage.