When you assign a housing unit to a buyer, they receive an email inviting them to create a personal account. Here is what the personal space accessible to the buyer looks like:

On this page, there are some details about the program, a few photos of the program, a "Messages" section where the buyer can find the personal messages you send them, and possibly an informational customization calendar.
It is from this personal space that the buyer can access the configurator to make their customizations.
All information can be customized from the "Details" tab of your professional space. Notifications can be sent from your TMA management interface.