Follow the steps below to add all your applicable tracking scripts.
1. Go to "Pages & Brand Website".
2. Click on "Brand Website & Global Scripts".
3. Create your Brand Website, if you haven't one yet. To learn how, click here.
4. Go to "Global Scripts" and paste all your applicable tracking scripts. And click on "Update".
Note that it will be applied to all your landing pages, thank you pages and site. This is the best place to add Retargeting, Google Analytics, Facebook Pixel, etc.
If you want to add more scripts to specific pages, you can add them on the specific Landing Page or Thank You page on Promotions.