(Please ensure prior that you are logged-in to your Amazon seller account as an admin user)
1. Click on Amazon MCF Settings under Configuration in our app.
2. Click on Add New Amazon Marketplace.
3. Add that new FBA marketplace you wish to add and click on connect. (If US is the existing FBA marketplace already, add another FBA. It may be a different FBA marketplace in your case.) This will take you to Amazon seller central page.
4. Once connected it will enable the connection automatically between BigCommerce store and Amazon seller via our app for newly added FBA marketplace. Also, it will take you back/ re-direct to our app again.