Google Ads Conversion Script Needs to Be Added to Page Header

Hi,

I previously submitted a ticket about adding Google Ad’s conversion script to one of my website pages. It was recommended that I add a code block to do this. You can see the ticket link below. The problem is Google needs this script added to the page header to recognize it and track our conversions. How do I access the header code for my page to add this script? I include the script and page link to the private content section below.

Thank you,
Kristina