Changing user profile name from permanent username to their nickname

Hi @preditor,

we have provided hooks to customise detail page header section.
seems like you are using supreme directory theme.
you can use the code below.

add_filter( 'sd_detail_author_link', 'sd_detail_author_link_callback');
function sd_detail_author_link_callback( $author_link ){
    global $post;
	$author_id = $post->post_author;
	$author_link = "<a href='" . get_author_posts_url( $author_id ) ."'>". get_the_author_meta('user_nicename' , $author_id ) . "</a>";
	return $author_link;
}