To configure a default printer for use with Express 1 and / or to set up a default label location, go to the Shipping menu in eCC and click on Configure Shipping Providers. Then click on the shipping provider, for which you want to configure settings. The same settings can also be accessed by going to File >> Configure store >> Shipping, and then clicking on the relevant shipping provider.
To set the default shipping options for Express 1, go to Shipping >> Configure Shipping Providers >>Express 1. Once there you can set the printer defaults as required and then click on Configure Default Shipping Rule to access the default settings.
Remember to click on 'Save' to save your settings, once you are done with the configuration.