Inserting sharing buttons into theme?

Im trying to insert the sharing buttons into my theme and I can’t figure out how to do it. I found this article
https://jetpack.me/2013/06/10/moving-sharing-icons/
But I can’t put this code into my theme directly or I just end up with code output on my page. What am I doing wrong?

if ( function_exists( 'sharing_display' ) ) {
    sharing_display( '', true );
}

if ( class_exists( 'Jetpack_Likes' ) ) {
    $custom_likes = new Jetpack_Likes;
    echo $custom_likes->post_likes( '' );
}

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