need to re-instate footer

in my newbie (to both wordpress and PHP) attempt to customize my first wordpress website, i seem to have removed the php code that tells somepage (header.php, index.php, page.php, post.php or all 4???) to pull in the contents of my footer.php file. what code do i need to put back and where do i need to put it to get the stuff from footer.php to be pumped back in to the website???? thanks!

current footer.php content:

<div id="footer">

<h5>The GCCC is a not-for-profit 501(c) (6) non-government membership organization. Member of CIANJ, Member ICC, affiliated with<br /> NJAWBO Bergen Chapter, affiliated with Bergen Community College small business development center.</h5><br />

? 2009 Gold Coast Chamber of Commerce<br /> Designed by <a href="https://www.adfgadfgadfg.com" target="blank">adfgadfgadfg.com</a></div>

<p><span class="credits">? <?php echo date('Y'); ?> <a href="<?php bloginfo('home'); ?>"><?php bloginfo('name'); ?></a></p>

<p><a href="<?php bloginfo('rss2_url'); ?>">Entries (RSS)</a> - <a href="<?php bloginfo('comments_rss2_url'); ?>">Comments (RSS)</a></span><br /></p>
</div>
<?php do_action('wp_footer'); ?>
</div>

</body>
</html>

by the way, here’s the site i’m working on, https://www.goldcoastchamber.com/wordpress/