authentication log in

good morning,
I want to secure a password when using the pgAdmin client to logon to the PostgreSQL DB.  No matter what passwords I put for connection with pgAdmin, all connected fine.  I have configured pg_hba.conf with md5, it works to prompt me for a password in the DB server as use psql.  If the password is not corrected, psql will prompt me an error but it's ok with pgAdmin.
pg_hba.conf:
  host      all                 all                127.0.0.1/32   md5host      all                 all                localhost         md5host      postgres        postgres       ip.0/24           ident host      cidr               username1    ip.0/24            password
host      cidr               username2    ip.0/24            password

would you please point me to what method should I use to authentication the log-in from the client?  It works find in AWS DB but not with Linux DB.
thank you.

Bach-Nga

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