Scroller - replace icons with FA

REPLACE:

<?php if($staff_linkedin) {?><li><a class="rad mk-social-linkedin" href="<?php echo ($staff_linkedin); ?>"></a></li><?php } else {}?>

WITH:

<?php if($staff_linkedin) {?><li><a class="rad " href="<?php echo ($staff_linkedin); ?>"><i class="fa fa-instagram"></i></i></a></li><?php } else {}?>