Participants can register or cancel a class registration on the MPDU website by clicking on the respective links below: To cancel a registration for an Orientation Seminar you will need the Orientation ID that was e-mailed to you when you registered for the class and the e-mail address you used to register. Montgomery County has arranged for Housing and Community Initiatives (HCI) to conduct First Time Homebuyer classes for the MPDU program. If you need to cancel or change your registration for a First Time Homebuyer class, please call 301.590.2765 or direct an email to adminasst@hcii.org.