1. Open the mobile App of Postal Savings Bank and log in to the account.

2. Look for it on the homepage or the preferential activities page, and click to enter Didi Travel related activities.

3. Find and select the 6 yuan voucher to be collected, and click the "Collect" or "Collect" button.

4. The system will generate a QR code and save it in the mobile phone photo album.

5. Open the Didi Travel App, select the "My" tab in the navigation bar at the bottom of the homepage, and enter the personal center page.

6. Find the "red envelope redemption" option at the bottom of the personal center page, and click to enter the redemption page.

7. There are two activation methods for redeeming the red envelope at the top of the page: entering the password and scanning the QR code. Select the "Scan QR code" option.

8. Open the saved full and reduced coupons provided by the Postal Savings Bank to users with the mobile phone camera.

9. After meeting the conditions, you can successfully activate the coupon and enjoy the corresponding amount to offset the service fee.