You have what looks to be a custom theme and the theme probably has a template of some sort to handle the ensemblet section. In the code for that section (which might be accessible through Appearance -> Editor -> Name of the file which holds this template), there should be a loop of some kind to pull the names from the database. Try pasting the code from that in to your question to get a better response.
In general, if your theme was developed using the WordPress framework, and it uses a custom post type for the ensemblet entries, it probably has a loop similar to this:
$wpdb->query("SELECT ID,post_name FROM {$wpdb->prefix}posts WHERE post_type="ensemblet" ORDER BY post_title;");
If you see something like this, replace the ‘ORDER BY post_title’ with ‘ORDER BY ID’ or ‘ORDER BY post_date’.
If the loop is more like this:
<?php /* Start the Loop */ ?>
<?php while ( have_posts() ) : the_post(); ?>
... some code ...
<?php endwhile; ?>
Then add in the following line above the while statement:
query_posts(‘orderby=date’);
If there already is a query_posts call, you will have to edit that line to include the orderby=date which could be represented two ways:
A string with an ampersand (&) before it:
query_posts('otherstuff=something&orderby=date');
Or using an array with an additional line added (make sure to add a comma to the next to last line):
$args = array(
'otherstuff' => 'something',
'orderby' => 'date'
);
query_posts($args);