Adding Pixel Facebook in my Page

Website Building
#1

Hi!

I need to add pixel script in two pages only:

How can I do that? i read in Internet but modify all headers, and I need in these only two. Furthermore, I read that modifying functions.php archive i can do it, but i don’t know how i can do that.

Regards,

Pierre Carvajal

#2

Maybe this will help some?

https://www.facebook.com/business/help/952192354843755

#3

Yeah but the plugin that they suggest affect all page headers and i need in two pages no more.