Wordpress Themes - WP Forum at BFA - Adding a php code in the theme?

Hi

i read many threads so i tried doing this:

i have one subtemplate called ads.php
there i have this (only for tests)
<?php
echo "Hello World";
?>

then as i want it to appear in every post after the pagination i have this at single.php in main templates section:

PHP Code:


		
			
        <?php comments_template( '', true ); ?>



        <nav class="singlenav cf">

            <div class="older"><?php previous_post_link(); ?></div>

            <div class="newer"><?php next_post_link(); ?></div>

        </nav>

        

          <div>



            <?php bfa_get_template_part( 'ads' ); ?>

        </div>

    </div>

    

    <div id="widgetarea-one" class="col4">

        <?php dynamic_sidebar( 'Widget Area ONE' ); ?>

       



    </div>

But im not seeing the hello world at any post,

can someone help me?

I just need to add some php code to render in posts or if simpler in all site.

Thank you

PS: i tried to include an outside php file but i had the same result