Your template seems to be using Picaflor Azul's MEGA MENU.
... and you are HIDING some of the menu options using {display:none} declarations in the stylesheet. (That's OK to do this - just bear in mind that you/your designer has chosen to DISABLE some features in the MEGA-MENU through CSS, rather than make edits to core code. This is a GOOD WAY of disabling the display of stuff on a website - if you are unsure of CODE EDITING).
Now...
You will have a file on your server...
includes\templates\bradford_pure\common\tpl_mega_menu.php
Around Line 146 / 147, you should see:
Code:
</li><!-- eof shop by brand -->
<li class="aboutus-li"><a href="<?php echo zen_href_link(FILENAME_ABOUT_US); ?>" class="drop"><?php echo HEADER_TITLE_ABOUT_US; ?></a><!-- bof about us -->
You can ADD your new link just AFTER that (<!-- eof shop by brand -->) bit.
Something like:
Code:
</li><!-- eof shop by brand -->
<li class="specialorders-li"><a href="index.php?main_page=page&id=17">Special Orders</a></li>
<li class="aboutus-li"><a href="<?php echo zen_href_link(FILENAME_ABOUT_US); ?>" class="drop"><?php echo HEADER_TITLE_ABOUT_US; ?></a><!-- bof about us -->
... Where " 17 " is the ID of that EZpage you created.
You may need to use the li class="specialorders-li" for styling purposes.
BACKUP the tpl_mega_menu.php file first... then try my addition.