Insight Tag / FB Pixel in html

Hey Fabienne,
You could add you Insight Tag and Facebook Pixel to these functions that you would add to the end of your functions.php file in Appearance > Editor:
Facebook Pixel

function add_fb_pixel_code(){
?>
Put Your Facebook Pixel Code Here
<?php
}
add_action('wp_footer', 'add_fb_pixel_code');

Insight Tag

function add_in_insight_code(){
?>
Put Your Insight Tag Code Here
<?php
}
add_action('wp_footer', 'add_in_insight_code');

Here is an example how it would look after adding your code:

function add_fb_pixel_code(){
?>
<script>
!function(f,b,e,v,n,t,s){if(f.fbq)return;n=f.fbq=function(){n.callMethod?
n.callMethod.apply(n,arguments):n.queue.push(arguments)};if(!f._fbq)f._fbq=n;
n.push=n;n.loaded=!0;n.version='2.0′;n.queue=[];t=b.createElement(e);t.async=!0;
t.src=v;s=b.getElementsByTagName(e)[0];s.parentNode.insertBefore(t,s)}(window,
document,'script','https://connect.facebook.net/en_US/fbevents.js');
fbq('init', '00000000000000000'); // Insert your pixel ID here.
fbq('track', 'PageView');
</script>
<noscript><img height="1″ width="1″ style="display:none"
src="https://www.facebook.com/tr?id=000000000000000&ev=PageView&noscript=1″
/></noscript>
<?php
}
add_action('wp_footer', 'add_fb_pixel_code');

When editing functions.php you should use the child theme, so your changes will not be lost with future theme updates Read about it & Get it here

Best regards,
Mike