connecting with pgAdmin II

OK, I figured out my version problems and am now running pgAdmin II on
my Windows XP box to connect to my psql 7.2 database on my Linux box.
Can't quite get it to connect, though; I'm getting this error message:

"No pg_hba.conf entry for host 192.168.2.102, user bbontempo, database
daniel".

(yes, user name and database name exist and are correct, assuming it
wants the username/password for accessing the server itself, and the
name of an existing psql database)

I _think_ this error message means I need to get into the pg_hba.conf
file and create that entry (and I think pg_hba.conf is supposed to be in
the 'pgdata' directory).  Unfortunately, I can find neither pg_hba.conf
(a 'whereis pg_hba.conf' gives me nothing) nor pgdata.

The help files in pgadmin II assume I know my way around Linux commands,
which I don't. So I'm stuck. Help!

=)
-d