how to add code to header or footer – bigcommerce stencil theme?

Here is quick video guide helps you add code to header or footer.

Daniel Steinberg Daniel Steinberg (Customer) asked a question.

How do I add code to my <head>?

I’m using a FB messenger platform and there is a snippet of code to add to site for visitors to opt-in. It says to place it into the <head> of every page of your website where you want it to appear. Where would that be?