Can you get to the file manager in your hosting admin panel? That is where you can see the folders and files on your site. You will need to download the correct file using an FTP client like Filezilla (free from Sourceforge), edit it on your pc with a good file editor like Notepad++ (also free from Sourceforge), and FTP it back to your template override folder on your site.
For the footer link:
/includes/templates/your_template/common/tpl_footer.php should have this:
PHP Code:
<!--bof- site copyright display -->
<div id="siteinfoLegal" class="legalCopyright"><?php echo FOOTER_TEXT_BODY; ?></div>
<!--eof- site copyright display -->
and you can edit FOOTER_TEXT_BODY in /includes/languages/your_template/english.php, line 16:
PHP Code:
define('FOOTER_TEXT_BODY', 'Copyright © ' . date('Y') . ' <a href="' . zen_href_link(FILENAME_DEFAULT) . '" target="_blank">' . STORE_NAME . '</a>. Powered by <a href="http://www.zen-cart.com" target="_blank">Zen Cart</a>');
We can't know exactly how the designer edited your files, so there may be some differences.