Open up includes/templates/YOUR_TEMPLATE/common/tpl_drop_menu.php.
If you're talking about adding it as another menu item, see how contact us is coded, like this:
<li><a href="<?php echo zen_href_link(FILENAME_CONTACT_US, '', 'NONSSL'); ?>"><?php echo HEADER_TITLE_CONTACT_US; ?></a></li>
But you don't have to use the zen cart coding to make a link, just make it your link instead, like this:
<li><a href="zencartpagelinkhere">Reviews</a></li>
<li><a href="zencartpagelinkhere">Currencies</a></li>
Decide where you want the links to show up, and put them there. If you want them to show up after shopping cart, they'd go after this:
<li><a class="noLine" href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>"><?php echo HEADER_TITLE_CART_CONTENTS; ?></a></li>
<?php } ?>
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