The coupon report will let you see how many times a particular discount code was used in orders and the amount of total discount given for each as well.
Note: This report can be accessed through Reports >> report type.
First, select the report type to find specific details of the report and the example screenshot is above. Once selected click the filter to load the report.
If you would like to look up a particular coupon, you can use "Filter" as a shortcut to search for it. Coupon can be filtered by selecting a start and end date
Clicking the "Edit" pencil button will direct you to that specific coupon edit form under Marketing > Coupon