Step 1: Choose which coupon codes appear on the account page
Discount codes you create under Discounts are synced into the app’s coupon list.
Step 2: Add the app block in Online Store > Edit theme
How to add the app block to the account page and the cart page.
Step 3: Adjust the display settings in Online Store > Edit theme
On the screen you reached in Step 2 you can adjust the basic colors and appearance.
Step 4: Installation complete
Press Save at the top right, check how it looks on your storefront, and setup is done.
If you use the new customer accounts
Check metafield permissions, add the block or the dedicated page, and adjust the display settings so the coupon list works with the new customer accounts.
[Shopify Plus only] Showing the coupon list at checkout
How stores on Shopify Plus can show the coupon list on the checkout page.