How can I apply a coupon code to the order in magento?

Please go to your shopping cart and scroll down. In the lower-left corner, you will find the Apply Coupon drop-down menu with a button: 

coupons in the cart

Click on it, enter your code, and click Apply:

apply coupon

Enter your coupon code and the discount will be calculated automatically.

Also, you can apply coupons on the checkout page:

coupons on checkout page

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