First open single.php and place the following code after the block of the_content.

<div class=”pagelink”><?php wp_link_pages(‘pagelink=Page %’); ?></div>

Second, open a post or page you would like to create additional pages on. Place the following code after a section of your entry <!–nextpage–>

Displays page-links in DIV for CSS reference as page-links.  You can edit or add page-links to styles.css.