Facebook conversion & pixel tracking
Once you've made these revisions to the code from Facebook, you are ready to place it on the Confirmation screen of your form. Click to edit the HTML of the confirmation screen, scroll to the bottom of your current confirmation and paste this code.
You can test the code by installing an extension for Google Chrome which you can read more about here. https://developers.facebook.com/docs/ads-for-websites/pixel-troubleshooting
Once you you install that extension, you can see if the instal is functioning properly by completing a transaction in test mode.