How to add external scripts to the Thank you page
This article assumes you are using our default thank you page.
If you want to set up your own custom thank you page (on which you can install all the scripts you want), check this article.
To add an external script to the Thank you page (for example, Facebook tracking pixel script), go to "Settings > Confirmation email" and scroll down till you find the "External scripts" box to add your scripts.
Your scripts will be automatically loaded into the Thank you page when people confirm their email addresses.
Don't forget to save your changes!