How to add author on WordPress Pages? Not blog article page

Question

WordPress has a function which does this for you. You’ll need some experiences with HTML, CSS, PHP to style the output and understand what that function does:

the_author() which displays the author of the post/page.

In your theme will most likely be a page.php template where you can add these on pages into The Loop like so:

<?php if( have_posts() ) : ?>
    <?php while( have_posts() ) : the_post(); ?>
        <div class="author"><?php the_author(); ?></div>        
    <?php endwhile; ?>      
<?php endif; ?>

Keep in mind you should create a child theme to do a change like that in order to avoid losing any data if the theme updates.