[[Plugin: wp-days-ago] Trouble Activating The Plugin *please help*

I am having a very hard time trying to activate this plug-in due to my lack of php knowledge.

The instructions given by the author are these:

– activate the wp_days_ago plugin

– You can now insert <? wp_days_ago(); ?> anywhere in The Loop in your WordPress theme.

I am using the news theme by devpress and this is the code in the Index.php where I want to replace [entry-published] with the wp-days-ago plugin which displays how much time ago the post was posted.

<?php echo apply_atomic_shortcode( 'byline', '<div class="byline">' . __( '[entry-author] [entry-published] [entry-edit-link before=" | "]', hybrid_get_textdomain() ) . '</div>' ); ?>

My question is where do i insert <? wp_days_ago(); ?> in there. Ideally It should display the date exactly where [entry-published] displays.

Thank you so much for any help.