Hi,
Add the below code in finctions.php file of your child theme:
function oceanwp_modify_comment_form_fields( $fields ) {
$commenter = wp_get_current_commenter();
$fields['author'] = '<div class="comment-form-author"><label for="author" class="screen-reader-text">'. esc_html( 'Enter your name or username', 'screen reader text for comment author', 'oceanwp' ) . '</label><input type="text" name="author" id="author" value="'. esc_attr( $commenter['comment_author'] ) .'" placeholder="'. esc_attr__( 'Name', 'oceanwp' ) .'" size="22" tabindex="0" class="input-name" /></div>';
$fields['email'] = '<div class="comment-form-email"><label for="email" class="screen-reader-text">'. esc_html( 'Enter your email', 'screen reader text for comment author email', 'oceanwp' ) . '</label><input type="text" name="email" id="email" value="'. esc_attr( $commenter['comment_author_email'] ) .'" placeholder="'. esc_attr__( 'Email', 'oceanwp' ) .'" size="22" tabindex="0" class="input-email" /></div>';
$fields['url'] = '';
return $fields;
}
add_filter( 'comment_form_default_fields', 'oceanwp_modify_comment_form_fields' );
PS- You can change/edit the code as per your need.