You will have to contact Customer Experience team: Adobe Audience Manager Learn & Support with your Adform account ID and any other relevant details. They'll then set up Server to Server destination (that'll appear under integrated platforms).
AAM has integration with AdForm, and Customer Experience team will be able to enable the ID sync for your AAM instance with AdForm. There is no such implementation required from you.
Also, ask for steps on how to map segments to destination, if there are any considerations while activating.