Overriding Meta tags in Drupal 7

Step 1

First install this module:
https://www.drupal.org/project/metatag

Step 2

Important : If you do not have a an instance of render($page[‘content’]) within your theme template page, make sure that you add the following to your template page:

render($page['content']['metatags']);

Step 3

Configure the module in the Drupal admin section.