After designing your emails in the editor, you need to export them to Shopify. This is a one-time setup per template.
Step by step
In the Smart Emails app, go to the Exports page
Select a template from the list (e.g. Order Confirmation)
Click Copy — the HTML code is copied to your clipboard
Shopify opens automatically on the right page
Select all existing code in the Shopify editor and replace it with your copied code
Click Save in Shopify
Repeat for each template you want to customize
After the export
Once a template is exported, changes to text, colors, buttons, footer, and marketing sections go live instantly — no need to repeat this process. You only need to export again if you change the structure (add/remove sections, switch preset).
See What changes go live instantly? for the full list.