I'm probably misreading something but I'm confused about setting up
postgre for a Conferencing install. I've installed the necessary
packages but is there some pre-installation setup of the database that
has to happen inside of postgre?

I ask because, with just the packages installed, the Conferencing
installer wants passwords for the database and I haven't set up
anything. Is the installer asking for values it will set or does it
expect them to be pre-set? Oh and if so, what should be set up. I don't
see anything described in the installation manual.