Go to Admin → Plugins → Email Service Providers, click Maropost and select the Green Activate Button.
Enter your ApiKey and CustomerId (these are provided by Maropost) click Connect
Click the blue edit button to get to the Advanced Setup
Click the green plus symbol to start creating your lists
Partial - Customers who had a product in their cart and entered some lead information
Decline - Orders that declined their transaction
Sale - Successful sales
Choose the campaign(s), the product(s), and what list to send the customer type to.