I am chris’s little brother, I was wondering how you change the center of a armature, because my game charactor has his center armature in his head, and there is no options that say “center new” or " center cursor" in the armature edit buttons. Bye, 
you would have to move the bones in edit mode, and then move the armature object so that the bones are where they started.
(pity those buttons are not avaliable, but would probably mess up animated armatures having them would(