How can I change next and previous post buttons?

Hi @bancurisicitate,

Inserting post navigation buttons on top of the featured image is a bit too big of a change for me to post detailed instructions on the support forums. In short, you’re going to have to create a child theme, copy over the singular.php file, add code outputting the post navigation links in the featured image area, and add CSS to style those links the way you want them (or match the markup to the gallery next/previous links so they inherit those styles).

— Anders

Hi, I am trying to create a child-theme but I doubt what should I copy in functions.php in order to include the style (what should be the handler):
this is what I have and just doesn’t work

add_action( 'wp_print_styles', 'fukasawa_load_style' );
function my_theme_enqueue_styles() {
    $parenthandle = 'parent-style'; // This is 'twentyfifteen-style' for the Twenty Fifteen theme.
    $theme = wp_get_theme();
    wp_enqueue_style( $parenthandle, get_template_directory_uri() . '/style.css', 
        array(),  // if the parent theme code has a dependency, copy it to here
        $theme->parent()->get('Version')
    );
    wp_enqueue_style( 'child-style', get_stylesheet_uri(),
        array( $parenthandle ),
        $theme->get('Version') // this only works if you have Version in the style header
    );