...
Wake up the machine by pressing any button
Enter your license plate number
Select "Purchase Parking"
Select "$2$3.00 per hour"
Enter how many hours you would like to pay for (even when using a coupon code you need to enter the number of hours you will be parked for, in the event your time runs out before you leave or add more time, you may receive a ticket for a full day's rate)
Enter yes, you have a coupon code
Enter the code
Print receipt
...