I need help about wordpress of members section

If I understand correctly you don’t need a shortcode or a filter. Just paste your yg_yorumsuz_link_gizle function into functions.php and call it from any template file (they all reside in your theme folder) such as single.php, or from a plugin.

if(function_exists('yg_yorumsuz_link_gizle')){ // just in case
    yg_yorumsuz_link_gizle();
}

If you’re only doing it in one place then you could even run your code inside the template file directly, without using functions.php. You need to modify the code in both cases to get rid of any $content-related logic.