QT can not connect to postgresql

i'm new to linux. i started the postgresql 7.3 server
in the root using red hat 9 and it says that
Postmaster already running. but when i used QT
Designer's database connection, in which i wrote
Driver: QPSQL7 database:bedrock, user: postgres, host:
localhost a dialog box appears stating: can not
connect to the database. please ensure that the
database is running and that all the connection
information is correct. [QPSQL: unable to connect
could not connect to server. connection refused. is
the server running on host localhost and accepting
TCP/IP connections on port 5432?

i tried to open the pg_hba.conf and postgresql.conf to
change the tcip from false to true still the problem
persists.

prior to this, when i used $ postmaster -D
/var/lib/pgsql/data, the following message is posted
FATAL: cannot open /var/lib/pgsql/data/PG_VERSION:
Permission denied.

sometime when i type service postgresql start in the
root the following message is posted:
bash: service: command not found

itried to loggin as posgres user and used bash-2.05b$
service postgresql start the same message is posted.
bash: service: command not found

i would appreciate any help on this matter.

thanks.

sincerely,

ramon

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