The ScreenSaver Property window is to change any settings after finished the New Wizard. It is very similar to the New Wizard, but has an additional option for you to make your own Shareware ScreenSaver which is a ScreenSaver that need to be registered.

Please click the button at the top of the ScreenSaver Property window to change any settings.

See also:
Using New Wizard -> General
Using New Wizard -> Default Foreground Settings
Using New Wizard -> Protection and Copyright
Shareware ScreenSaver