Hi Tom,

Unfortunately, the Staff cannot provide support for the construction of custom code itself, but I might be able to help you out in understanding where to paste the code.

Check the Facebook's documentation about where you need to place that.

Should you need it on every page, you can add in at Step 1 -> SEO, Code... -> Expert section. There, you should check with Facebook where exactly you need to place that.

Alternatively, if you need it on some specific pages only, you can go to Step 3 -> Properties per a specific page -> Expert section and then do just the same.

Let me know if I can offer further insight on this

Thank you

Stefano