Questions? Bugs? Feedback? First, read the files in directory /usr/src/pgsql/doc/. The FAQ in this directory may be particularly useful.
If Postgres failed to compile on your computer then fill out the form in file /usr/src/pgsql/doc/bug.template and mail it to the location indicated at the top of the form.
Check on the web site at http://www.postgresql.org For more information on the various support mailing lists.
Read the upstream documentation. For corrections, first check the current manual.