Follow these steps:

1.. Go to Thesis > Custom File Editor

2.. Select custom_functions.php [ take a backup before editing is always a safe side 😀 ]

3.. paste this code


function custom_byline() { if(is_single()){ ?>
<p class="headline_meta"><?php thesis_author(); ?> on <abbr class="published" title="<?php echo get_the_time('Y-m-d'); ?>"><?php echo get_the_time(get_option('date_format')); ?></abbr> - <?php the_category(', '); ?></p>
<?php } }
add_action('thesis_hook_before_post', 'custom_byline');