gistfile1.txt

add this before 

<!--.social-media-->

<?php if($at_options['pinterest'] != '') {?><li class="tt" data-toggle="tooltip" data-container="body" data-placement="left" title="<?php _e('Find us on Pinterest','at'); ?>"><a href="<?php echo $at_options['pinterest']; ?>" class="icon-pinterest"></a></li><?php } ?>


and in inc/theme-options.php

add this 

$settings[] = array(
  'id' => 'pinterest',
	'title' => __('Pinterest link','at'),
	'type' => 'text',
	'std' => '#'
	);

above of

$settings[] = array(
	'id' => 'contact',
	'title' => __('Contact Settings','at'),
	'type' => 'heading'
	);