Steps-by-Steps
1. Create customer for the ecommerce perform. Please see How to create new customer for details
2. Go to Ecom Integration Setup List to create platform code and integration setup
3. Go to Order Import page by use the search function
(1) Click on the Search button
(2) Enter order import
(3) Select the link Order Import
4. In Order Import page, click 
button in Platform field to select which platform you want to setup the import configuration
5. Select Import configuration to setup for the platform
6. In Order Import Configuration page, select + button to create configuration for Ecommerce Customer