Normal coupons are created when you want to create single coupon code for the customers to avail discount for your event.
To create a Normal Coupon click on "Create normal coupon" in the manage coupon section. Give your coupon a coupon name and coupon code. Specify the start and end date for the coupon (when it will be applicable) and the coupon type whether customers can avail a fixed amount or whether it will be certain percentage of the total amount. Also check the ticket type to which the coupon is added and click on Save to save the changes.