how to sort posts by …..

To resort the order of posts, using the WordPress Default theme for example, in the wp-content/themes/default/index.php file, just before the line:
<?php if (have_posts()) : ?>

put this:

<?php query_posts($query_string . '&orderby=date&order=ASC'); ?>

The query_posts() article explains the arguments in detail.

thank you MichaelH; but how can i make the visitor chosing

https://www.ads-software.com/extend/plugins/wp-smart-sort/