First make sure you have followed the instructions at Section 1, “Using the Debugger” in case of bluefish crash.
You can use bug-buddy or go to http://bugzilla.gnome.org/browse.cgi?product=bluefish, the bluefish bugzilla page on bugzilla org gnome, to fill in the bug report.
The following instructions are related to bug-buddy. Nevertheless, though the form differs when filling a bug report from the bluefish bugzilla page, the necessary bits of information are the same.