Register yourself by creating a login. Add your phone number, email, create a password, and input your vehicle information. You want to be sure you add all the vehicles you will use downtown and update them as necessary. If you are using someone else's car, you are paying for someone else, or are renting a car, be sure to add those as well. Use the exact plate number even if it is a temp plate. Failure to use the correct license plate number (example don't use - RENTAL, NOPLATES, FORGOT, DONTKNOW, etc) may result in a ticket. Add your payment information as well at this time.