First, know your coupon ID. You can navigate to your Coupon Admin, click the coupon and then look at the URL - it will have a cid parameter, something like cid=16. In this example, your coupon ID would be 16.
Next, know your customer ID. It's the first column in your customers listing. Let's say for our example customer ID would be 3568.
Go to Tools->Install SQL Patches and run the following query (BACKUP your database before running any SQL queries):
Code:
DELETE FROM coupon_redeem_track WHERE coupon_id = '16' AND customer_id = '3568';
This should allow that single customer to use that coupon again.
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