the_author_posts_link bug

I am trying to link the author’s name and surname to its right page , like this:

posted by <?php the_author_posts_link(‘idmode=namefl’); ?>

but it doesn’t work. Is there any way to make name and surname of the author to be on the place of the nickname, in the index page?

I’ve been trying for 2 days but still got no rid.

Can anyone help me?
Thanks, ah!