BUG #5144: Issue changing password

The following bug has been logged online:

Bug reference:      5144
Logged by:          George Francis
Email address:      gf@liquidpoint.com
PostgreSQL version: 8.3
Operating system:   Windows 2000
Description:        Issue changing password
Details:

I am trying to recover my lost password for my SU account and am having
trouble.

I edited the pg_hba.conf file and added the line "local all all trust".

I then stopped and restarted the service and still get prompted to login
when entering psql.

How can I do this so that I can change my password for the "postgres" user?