To set up coupons for following a store on AliExpress, you need to follow the steps below:

1. Open the AliExpress website or App and log in to your account.

2. Find the store you want to follow on the homepage or search bar.

3. After entering the store page, look for the entrance to the coupon or coupon center. Usually, you can find these entrances on the store homepage, product details page or shopping cart page.

4. Click to enter the coupon or coupon center page and browse the coupons available.

5. Select the coupon you are interested in and click the Get or Get Now button. Some stores may require you to follow the store before you can get the coupon, so make sure you have followed the store.

6. If the coupon is successfully received, it will be stored in your AliExpress account and you can use it at checkout.

7. Select the item you want to buy on the checkout page and pay, and the coupon discount will be automatically applied.

Please note that the coupon redemption settings may vary from store to store, so make sure you follow the specific store page instructions.