python connection to postgresql on ubuntu

[Ian]

Hi

ubuntu hoary server and Postgresql 8

my setup is ->
Zope Version...(Zope 2.7.5-final, python 2.3.5, linux2)
Python Version...2.3.5 (#2, Mar 29 2005, 15:41:06) [GCC 3.3.5 (Debian 1:3.3.5-8ubuntu2)]
System Platform...linux2
SOFTWARE_HOME../usr/lib/zope2.7/lib/python
ZOPE_HOME../usr/lib/zope2.7
INSTANCE_HOME.../var/lib/zope2.7/instance/plone-site
CLIENT_HOME.../var/lib/zope2.7/instance/plone-site/var

and i aptitude installed python-psycopg and zope2.7-psycopgda
how can I add ZPsycopgDA into my INSTANCE_HOME so that in the ZMI I can then add a Database
Connection to postgresql??..
just starting with zope/plone so if i have missed something very obvious apologies in advance
[]'s
Ian