how can add review by, edit by (Author) on wordpress site

You can achieve this with the help of ACF Plugin through which you are able to create Custom Fields and these fields will be helpful in getting the information regarding Review Person and Review date or any other information you needed.

After this you can go to themes files and here you need to edit single.php and page.php file, and then you need to add the code to the position where you want to show.

<?php if ( function_exists( 'get_field' ) ) {
?>
    <div class="post-meta">
        <?php
        if ( $reviewer = get_field( 'reviewed_by' ) ) { ?>
            <p>
                Reviewed by: <?php echo esc_html($reviewer); ?>
            </p>
        <?php
        }
        ?>
        <?php
        if ( $review_date = get_field( 'review_date' ) ) {
        ?>
            <p>
                Review Date: <?php echo esc_html( $review_date ); ?>
            </p>
        <?php
        }
        ?>
        <?php if ( $editor = get_field( 'edited_by_author' ) ) {
        ?>
            <p>
                Edited by: <?php echo esc_html( $editor ); ?>
            </p>
        <?php
        }
        ?>
        <?php
        if ( $edit_date = get_field( 'edit_date' ) ) { ?>
            <p>
                Edit Date: <?php echo esc_html( $edit_date ); ?>
            </p>
        <?php
        }
        ?>
    </div>
<?php
}
?>