How to alphabetize posts on Twenty Ten theme?

How do I alphabetize posts in two categories on my blog using the Twenty Ten theme? I saw the WordPress Codex has this article on alphabetizing posts. It says:
Edit your theme’s category.php file, and make the following changes, just before The Loop:

<?php
get_header();
?>

<div id=”content”>

<?php
// we add this, to show all posts in our
// Glossary sorted alphabetically
if (is_category(‘Glossary’))
{
$posts = query_posts($query_string .
‘&orderby=title&order=asc&posts_per_page=-1’);
}
// here comes The Loop!
if (have_posts()) : while (have_posts()) : the_post(); ?>

Where do I put that in the Twenty Ten category.php? It goes:

<?php
/**
* The template for displaying Category Archive pages.
*
* @package WordPress
* @subpackage Twenty_Ten
* @since Twenty Ten 1.0
*/

get_header(); ?>

<div id=”container”>
<div id=”content” role=”main”>

<h1 class=”page-title”><?php
printf( __( ‘Category Archives: %s’, ‘twentyten’ ), ‘<span>’ . single_cat_title( ”, false ) . ‘</span>’ );
?></h1>

<?php
$category_description = category_description();
if ( ! empty( $category_description ) )
echo ‘<div class=”archive-meta”>’ . $category_description . ‘</div>’;

/* Run the loop for the category page to output the posts.
* If you want to overload this in a child theme then include a file
* called loop-category.php and that will be used instead.
*/
get_template_part( ‘loop’, ‘category’ );
?>

</div><!– #content –>
</div><!– #container –>

<?php get_sidebar(); ?>
<?php get_footer(); ?>

Do I have to edit out any lines from the original category.php? Which lines please? What should the coding be?

I tried using the plugin WP-SNAP! But I couldn’t alphabetize posts using the plugin.

Please help. Thank you.