Siimple does not directly support adding the Meta pixel to your site. But you can easily link Google tag manager (GTM) to your site with your Meta pixel set up there.
Here’s a link to instructions on adding Meta pixel with GTM: https://www.facebook.com/business/help/1021909254506499
And when you’re done, you can enable GTM to your Simple site by clicking on the 'Settings' tab in your editor and follow the instructions below:
If you have any issues getting that setup, just chat in with us and we'll get you sorted.