How to display html in only the first level of WP comments?

You can do this in the comments loop:

if( empty( $comment->comment_parent ) ) { //if the comment does not have a parent, then it is L1
    echo 'my-custom-html';
}

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)