1. First open the Gaode Map APP, click "My" in the lower right corner to enter the personal page, and then click "Coupon".

2. Then on the coupon page, click on the McDonald's coupon to enter the McDonald's coupon details page.

3. Then click "Use Now" on the McDonald's coupon details page to enter the order payment page.

4. Finally, on the order payment page, select the coupon and click "Use", and then click "Submit Order" to complete the payment.