title not working

title not working
header title code of my website is

<title>
<?php if (is_front_page()) {
	echo get_bloginfo('name').' - '. get_bloginfo( 'description' );
	}
	elseif ( is_single() ) {
		the_title();
		}
		elseif (is_page()) {
			the_title(); echo ' | '; echo get_bloginfo('name');
			}
			elseif (is_category()) {
				single_cat_title(); echo ' | '; echo get_bloginfo('name');
				}
				elseif (is_month()) {
					echo 'Archive for '; echo the_time('F, Y');
					}
					elseif (is_tag()) {
						echo 'Items tagged '; echo single_tag_title();
						}
						else {
							}
?>
</title>

where i put the new code?
i tried to use force option but still not working.

http://wordpress.org/plugins/wordpress-seo/