You can only activate this card while there are 3 Normal Monsters of the same name (except Tokens) on your side of the field. The 3 Normal Monsters of the same name can attack your opponent's Life Points directly during the turn that this card is activated.
Probably because lady "2" and "3" are effect monsters. I think it says their name is treated are harpie lady only... If so then they are still effect monsters, which means not normale and delta attacker won't work. If you could get harpie lay "1"s then this could be a very deadly combo with one proper field(harpie or the other one for winged beast), one delta attacker, and one harpie with two egos