Unsure where to report bug

["dominijannir" <dominijannir@ct.metrocast.net>]

Hi,

I'm running Gnome on Etch (AMD64) and, after today's batch
of updates, started having the following problem:

Unless the Configuration Editor has been used to set the
screensaver to a blank page, opening
Desktop->Preferences->screensaver (either Gnome's or
xscreensaver) immediately logs me out and puts me at the gdm
login screen.

Where should I report this bug and what information should I
provide?  (As you can tell, I'm new at this.)

Thank you,
Roberto Dominijanni