The following are the steps to create Active Campaign Opt-in form in AMP
Step 1: Login or SignUp at Active Campaign
Step 2: Create or select a list
Step 3: Create or select a form
Step 4: After creating a form, from the embed section copy the url and list id as shown in the image.
Step 5: Now create an AMP Opt-in
Step 6: Now select Active Campaign from Dropdown and enters the URL and Listid
Ready to Rumble!
You can read more about creating AMP opt-in forms here: Opt-in-forms-in-amp
And can read about AMP Opt-in Forms here: Opt-in Forms