Great question — answering as the UphillTech team:
From what I see on that theme it would not be in header.php. It would be related in the theme since it already has an SEO optimization feature built in. You need to go through the functions.php and seek SEO and remove modify this line: $default='global|slider|layout|seo|translations'; to $default='global|slider|layout|translations'; Which will remove the setting to be included to the options. If this does not work go into inc/settings.php and remove line 368-402 which should look like: 'seo'=>array( 'name'=>'SEO', 'content'=>array( 'description'=>array( 'type'=>'text','name'=>'description','value'=>'','ttl'=>'Site description' ), 'keywords'=>array(...
Full answer by Jon Limitless: https://wordpress.stackexchange.com/a/87975 (CC BY-SA 3.0).
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