def set_tag(note_store, my_tags, tag_id):
        """
            create a tag if not exists
            :param note_store evernote instance
            :param my_tags string
            :param tag_id id of the tag(s) to create
            :return: array of the tag to create
        """
        new_tag = Types.Tag()
        for my_tag in my_tags.split(','):
            new_tag.name = my_tag
            note_tag_id = EvernoteMgr.create_tag(note_store, new_tag)
            if note_tag_id is not False:
                tag_id.append(note_tag_id)
            else:
                return False
        return tag_id