Tracking Code for Shopping Cart

I am using a ecwid shopping cart on my site (www.shiningstarsmagazine.com/store) and I just set up the Affiliate Manager. Their documentation says:

Almost all systems ask to add some specific conversion/affiliate tracking code to your conversion page, also known as “Thank you for your order” page, i.e. the last checkout page a customer sees when he placed an order successfully.That code, being placed on your site, tracks referrals and sync sales data with the affiliate system’s servers. Ecwid has an easy way to add such codes. Just open the “System Settings → General → Cart” page, find “Checkout Settings” section and enter the code there.

Where do I find this tracking code? Thanks!