So I have just finished up doing my housing registration and preferences and thought I would share the experience here.
After receiving the email you can log into your dorms account and the housing registration button will be activate. It will require you to fill in come info (including the name that you want to appear on you name badge) before you continue.
After reading over and signing some forms you are able to get in to doing your preferences. First it will ask if you wish to be adventurous and let Disney pick your roommates or if you wish to link (my arrival could only link with up to 1 other person).
Then you get to choose if you want to order your housing preferences or let Disney randomly assign you one. If you choose to select then you will be able to move all the options around and order from highest to lowest preference. Once you are finished you will confirm the details and receive your boarding pass for your check-in day.

This is the current housing options and costs effective for May 5th 2019 through December 31st 2019. We did also receive the pricing and options for the next period but I will post about that at a later time when I talk about extensions.