How to add tracking code to signup/login page for affiliate?

I need to add tracking code put some code on the head on

https://aff.digitalinbro.com/affiliate/signup/digitalinbro
and
https://aff.digitalinbro.com/portal/signin/digitalinbro

is this possible? its really important for us to retarget our affiliate also

Hello,
You can use the option "Add Script" provided under Checkout Customizer, to add any tracking code in Checkout page as well as Thank you page.