zeaks

@robirizarry I did try to do it that way first, it would be better, but I couldn’t get it to work for me.

Did you manage to figure this out?

Using this might be better, it won’t effect the other layouts.
.one-column #page { }

Figured I’d add this. If you want it to show on category pages, you’ll need to edit category.php and edit line 44 the same way index.php was edited in the above post.

I was wondering this too. I filled out the author biography but it doesn’t display.
It’s displaying here
http://twentyelevendemo.wordpress.com/2011/05/04/featured-posts-in-twenty-eleven/

Just tried to add this to a child theme and got it working.
First create a functions.php for your child theme and add

// Show Wp-PageNavi when it's active
function twentyeleven_child_content_nav( $nav_id ) {
	global $wp_query;
	if ( $wp_query->max_num_pages > 1 ) : ?>
	   <?php /* add wp-pagenavi support for posts */ ?>
		<?php if(function_exists('wp_pagenavi') ) : ?>
			<?php wp_pagenavi(); ?>
			<br />
				<?php else: ?>
		<nav id="<?php echo $nav_id; ?>">
			<h3 class="assistive-text"><?php _e( 'Post navigation', 'twentyeleven' ); ?></h3>
			<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">←</span> Older posts', 'twentyeleven' ) ); ?></div>
			<div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">→</span>', 'twentyeleven' ) ); ?></div>
		</nav><!-- #nav-above -->
	<?php endif; ?>
	<?php endif;
}

Next copy index.php to your child theme folder and change line 31 to
<?php twentyeleven_child_content_nav( 'nav-below' ); ?>

If wp-pagenavi is installed it will show it, if it isn’t, it’ll show the default next/previous