Correct Set Up Of Facebook Pixel

Hello,

This should be a relatively easy fix but it looks like I don't know anyone who can do this. I already have my pixel set up on my website, my old web developer installed the code into my header and footer (I think). However, he didn't include the content_id stuff for viewpage/add_tocart or whatever so I can't carry out any dynamic adverts by using my catalog to remarket products that people have already viewed.

I basically just need the pixel code looking over on my website and if there's any code missing, add it so it means I can use the above mentioned.