Log in to Shopify and click on “Sales Channels”:
Then click on “Online Store”.
On the page that opens, click on ”…” and then “Edit code”.
An editor window opens. There, click on “layout” and then “theme.liquid”.
A text editor opens. Here you can insert the Hello Email Script. Copy it from the page.
Paste it anywhere under <head> in the code:
Then click on “Save”.
Test
To test whether the script is working correctly, click on “Test Script” and follow the instructions.