This might work.
1.Open your page.php (or some other custom-page-template.php in which you want to make it work)
2.look for the line where you see
<?php the_content(); ?>
3.Insert
<?php wp_link_pages(); ?>
on the very next line like this
<?php the_content(); ?>
<?php wp_link_pages(); ?>
4.Go back to your editor and refresh the preview.
5.Now if its working just publish the page!
If you want to configure it visit the codex page here