In the Discount Code field
Firstly, select the Enter Code Manually option.
![](https://shineapps.co/wp-content/uploads/2023/07/email-popup-manually-field.png)
In the Shopify Store Backend
Then, head to the Discount section -> Copy the title of the discount.
![](https://shineapps.co/wp-content/uploads/2023/07/email-popup-copy-code.png)
Enter Discount Code
Then come back to the setting interface of ShineTrust and paste the code into the Enter Discount Code.
![](https://shineapps.co/wp-content/uploads/2023/07/email-popup-enter-discount-code.png)