change comment form

Good evening,

I hope somebody can help me on this english forum, in the dutch forum nothing is going on :-(.

This post looks like a long post, but I put in the code I have found in my FTP files because I did a lot of searching but don’t know what to do!

I would like to adjust my comment form:
– email must be visible;
– the field to fill in the URL can be removed;
– if possible I would like to have an extra field where people can give a name to the post (and this should be visible too).

How can I achieve this?

From wordpress I found this:

wp-comments-post.php

<?php
/**
 * Handles Comment Post to WordPress and prevents duplicate comment posting.
 *
 * @package WordPress
 */

if ( 'POST' != $_SERVER['REQUEST_METHOD'] ) {
	header('Allow: POST');
	header('HTTP/1.1 405 Method Not Allowed');
	header('Content-Type: text/plain');
	exit;
}

/** Sets up the WordPress Environment. */
require( dirname(__FILE__) . '/wp-load.php' );

nocache_headers();

$comment_post_ID = isset($_POST['comment_post_ID']) ? (int) $_POST['comment_post_ID'] : 0;

$post = get_post($comment_post_ID);

if ( empty($post->comment_status) ) {
	do_action('comment_id_not_found', $comment_post_ID);
	exit;
}

// get_post_status() will get the parent status for attachments.
$status = get_post_status($post);

$status_obj = get_post_status_object($status);

if ( !comments_open($comment_post_ID) ) {
	do_action('comment_closed', $comment_post_ID);
	wp_die( __('Sorry, comments are closed for this item.') );
} elseif ( 'trash' == $status ) {
	do_action('comment_on_trash', $comment_post_ID);
	exit;
} elseif ( !$status_obj->public && !$status_obj->private ) {
	do_action('comment_on_draft', $comment_post_ID);
	exit;
} elseif ( post_password_required($comment_post_ID) ) {
	do_action('comment_on_password_protected', $comment_post_ID);
	exit;
} else {
	do_action('pre_comment_on_post', $comment_post_ID);
}

$comment_author       = ( isset($_POST['author']) )  ? trim(strip_tags($_POST['author'])) : null;
$comment_author_email = ( isset($_POST['email']) )   ? trim($_POST['email']) : null;
$comment_author_url   = ( isset($_POST['url']) )     ? trim($_POST['url']) : null;
$comment_content      = ( isset($_POST['comment']) ) ? trim($_POST['comment']) : null;

// If the user is logged in
$user = wp_get_current_user();
if ( $user->exists() ) {
	if ( empty( $user->display_name ) )
		$user->display_name=$user->user_login;
	$comment_author       = $wpdb->escape($user->display_name);
	$comment_author_email = $wpdb->escape($user->user_email);
	$comment_author_url   = $wpdb->escape($user->user_url);
	if ( current_user_can('unfiltered_html') ) {
		if ( wp_create_nonce('unfiltered-html-comment_' . $comment_post_ID) != $_POST['_wp_unfiltered_html_comment'] ) {
			kses_remove_filters(); // start with a clean slate
			kses_init_filters(); // set up the filters
		}
	}
} else {
	if ( get_option('comment_registration') || 'private' == $status )
		wp_die( __('Sorry, you must be logged in to post a comment.') );
}

$comment_type = '';

if ( get_option('require_name_email') && !$user->exists() ) {
	if ( 6 > strlen($comment_author_email) || '' == $comment_author )
		wp_die( __('<strong>ERROR</strong>: please fill the required fields (name, email).') );
	elseif ( !is_email($comment_author_email))
		wp_die( __('<strong>ERROR</strong>: please enter a valid email address.') );
}

if ( '' == $comment_content )
	wp_die( __('<strong>ERROR</strong>: please type a comment.') );

$comment_parent = isset($_POST['comment_parent']) ? absint($_POST['comment_parent']) : 0;

$commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type', 'comment_parent', 'user_ID');

$comment_id = wp_new_comment( $commentdata );

$comment = get_comment($comment_id);
do_action('set_comment_cookies', $comment, $user);

$location = empty($_POST['redirect_to']) ? get_comment_link($comment_id) : $_POST['redirect_to'] . '#comment-' . $comment_id;
$location = apply_filters('comment_post_redirect', $location, $comment);

wp_safe_redirect( $location );
exit;

This I found in my pagelines lite template:

comment.php

<?php
/**
 * COMMENTS
 *
 * The template for displaying Comments.
 *
 * @package     PageLines Framework
 * @since       1.0
 *
 * @link        http://www.pagelines.com/
 * @link        http://www.pagelines.com/tour
 *
 * @author      PageLines   http://www.pagelines.com/
 * @copyright   Copyright (c) 2012, PageLines   hello@pagelines.com
 *
 * @internal    last revised February 23, 2012
 * @version     2.1.1
 */

if(!have_comments() && !comments_open())
	return;

?>

<div id="comments" class="wp-comments">
	<div class="wp-comments-pad">
	<?php 

		/* Stop the rest of comments.php from being processed,
		 * but don't kill the script entirely -- we still have
		 * to fully load the template.
		 */
		if ( post_password_required() ){
			printf('<p class="nopassword">%s</p></div></div>', __( 'This post is password protected. Enter the password to view any comments.', 'pagelines' ) );
			return;

		}

		if ( have_comments() ) : ?>
			<h3 id="comments-title"><?php
			printf( _n( 'One Response to %2$s', '%1$s Responses to %2$s', get_comments_number(), 'pagelines' ),
			number_format_i18n( get_comments_number() ), '<em>' . get_the_title() . '</em>' );
			?></h3>

			<ol class="commentlist">
				<?php wp_list_comments(array('avatar_size' => 45)); ?>
			</ol>
			<?php if ( get_comment_pages_count() > 1 && get_option( 'page_comments' ) ) : // Are there comments to navigate through? ?>
						<div class="navigation fix">
							<div class="alignleft"><?php previous_comments_link( __( "<span class='meta-nav'>&larr;</span> Older Comments", 'pagelines' ) ); ?></div>
							<div class="alignright"><?php next_comments_link( __( "Newer Comments <span class='meta-nav'>&rarr;</span>", 'pagelines' ) ); ?></div>
						</div> <!-- .navigation -->
			<?php endif; // check for comment navigation ?>

<?php 	else : // or, if we don't have comments:

			/* If there are no comments and comments are closed,
			 * let's leave a little note, shall we?
			 */
			if ( ! comments_open() ) :
		?>
			<p class="nocomments"><?php _e('Comments are closed.', 'pagelines');?></p>
		<?php endif; // end ! comments_open() ?>

<?php
		endif; // end have_comments() 

	comment_form(); ?>
	</div>
</div>

Hope to hear from you!

Kind regards Willem