Hi Rosea,
How should I report bugs?
First, search for the package name on http://www.debian.org/Bugs/ to
see if someone has already reported a particular bug. If so, click the
link on the bug page to reply or subscribe by email to the bug report.
If it really is a new bug, use the reportbug tool, see:
http://www.debian.org/Bugs/Reporting
And is it possible to add wishes for new packages
Yes, this is called a 'wnpp':
http://www.debian.org/devel/wnpp/
> or changes to packages?
That would be a bug report with severity 'wishlist':
http://www.debian.org/Bugs/Developer#severities