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 (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?

https://forum.bigcommerce.com/s/question/0D51B000048NtcySAC/how-do-i-add-code-to-my-head?s1oid=00D30000001FDCG&OpenCommentForEdit=1&s1nid=0DB13000000Gmw5&emkind=chatterPostNotification&s1uid=0051B00000Cdq7l&emtm=1517348755318&fromEmail=1&s1ext=0