adding title and description to header php

hei my all in one seo pack doesmnt seem to have added title nor description

here is the code please pleae tell me where to add these cos i dont want to get it wrong thanks ben

<?php if( is_front_page() ) : ?>
<title><?php bloginfo(‘name’); ?> |<?php bloginfo(‘description’);?></title>
<?php elseif( is_404() ) : ?>
<title>Page Not Found | <?php bloginfo(‘name’); ?></title>
<?php elseif( is_search() ) : ?>
<title><?php print ‘Search Results for ‘ . wp_specialchars($s); ?> | <?php bloginfo(‘name’); ?></title>
<?php else : ?>
<title><?php wp_title($sep = ”); ?> | <?php bloginfo(‘name’);?></title>
<?php endif; ?>