It turns out Netflix has incredibly helpful 24/7 support.
This is really the answer to this question:
While logged into the old account and with the app showing the list of movies, hit the following sequence of buttons on the TV remote: up, up, down, down, left, right, left, right, up, up, up, up.
Does anyone know how to change the account/login info on the SmartHub Netflix app? I am currently logged in with a cancelled account and there is no visible way to logout or change the user info.