How to add meta title? I want to add this line above my title 

&lt;meta name="viewport" content="initial-scale=1.0, width=device-width,  minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" /&gt;


How can I ?
You can put this on html.tpl.php in drupal 7 , else you can have it on page.tpl.php. 

As a note if you are putting it on page.tpl.php remember you have to put it on every other page overriding template page--front.tpl.php etc.