Select Settings from the Registration drop-down
Expand the Coupons section and click + Add Coupon Discount
Enter a name for the coupon in the Coupon Name box (Use the customer's name if it's a one-off coupon)
Select whether you want it to be a dollar amount or a percentage off
Enter the dollar amount or percentage
Enter an expiration date
Enter the number of uses allowed for the code
Click the save Icon
Click the copy icon to copy the discount code and send to the customer