How to insert Facebook audience pixel to every page

[PhilSid]

Hello guys

 

I would like to insert the Facebook audience pixel to every page on my webshop - or at least to the category pages of the shop as suggested on the Facebook Help site:

 

<<Step 3: Paste the Custom Audience pixel into every page of your website.

We recommend placing the code immediately before the closing </head> tag in your HTML. If your site has a global include file, such as a header.php, place the code there. Placing the code in the header isn't necessary, but will improve the quality of the events sent to Facebook.>>

But I have no idea how I can find this pages..are this any of these? Is it in the theme files, where all the .tpl files are?

 

I also was looking for models that can do that, but it seems that the modules only insert it on the main page. or am I wrong?

 

Looking forward to some help about this.

 

Cheers,

Philipp