Meta title & description not appearing, are tags required?

Hi Guys,

I recently installed the WPMU DEV SEO plug-in. Everything appears to be set up correctly however titles and meta descriptions for all pages and posts do not appear in my source code.

Do I have to insert a tag into my header.php template?

Site is live at http://www.eqlife.co.uk.

Any help would be much appreciated as always!