Overview of properties file, etc.

[cthulhu]

Long time user of Subsonic but been away the past couple of years. Got a new server up and now I am looking for the overview for customization, e.g., how to set the default theme for all users, the way to write the welcome messages with italics, bolding, etc. I recall there used to be a general overview of the Properties file for doing such things and even how to add images to the different frames, etc. Where can I now find such help?

Thanks!