Problem with pgaccess

I have been trying to set up my first database using
postgresql-7.3.4-11 on Red Hat Fedora Core 1 Linux.
I setup database and I can access it from prompt
> psql RabStudies

I downloaded and installed pgaccess-0_99_0_20040219.tgz
to make my life easier, but when I try to access
database I get the following message

Error trying to connect to database 'RabStudies' on local host.
PostgreSQL error message: Connection to database failed could not
connect to server: Connectionrefused  Is the server running on host
localhost and accepting TCP/IP connections on port 5432?

I don't have any clue what is wrong and how to fix it, so any
suggestions will be appreciated.

Michal