Add customers to your Campaign Monitor email lists.
Allow customers to sign up for your email newsletters by adding an opt-in checkbox to the user registration form of your Exchange store.
After uploading and activating the Campaign Monitor Add-on, click the settings gear on the Exchange Add-ons page to configure your Campaign Monitor Settings.
Add your Campaign Monitor API Key and select your Campaign Monitor Client and Campaign Monitor List for adding your new customer subscribers.
Customize your Campaign Monitor Label (the message that displays next to the opt-in checkbox on the customer registration form) and select whether to check the Campaign Monitor box by default.