Open Database with Pgaccess

I know, it's a basic question (sory) but i didn't find doc.
I'm working with Postgres6.3.2 and pgacess0.9 (with Linux Redhat 5.2 or
Debian 2.0)
I've done :
* on root account
* su postgres
* createuser Dizzy (this user already exists (users-group))
* that's was Ok

* on Dizzy account
*createdb KADOCKDB
*psql KADOCKDB
*create table client (nom_client char(20) not null primary
key);
And all seems OK

But with Pgaccess, I can't open database
Host localhost
Port 5432 (???)
Database KADOCKDB
Username Dizzy
Password (Dizzy-Password)

Error connecting database
Is postmaster running (Yes )
and accepting TCP.IP connection at 'localhost' on port '5432' (I don't
know)

Thanks for you answer

( Where can i find documentation and script about
Apache->CGI(Perl)->Postgres ?)
(I've downloaded DBI an DBD)