Hostname: localhost

localhost means you installed postgresql in your machine. If you want to take database from any another machine, you have to give ip address instead of localhost(like 192.168.11.1)

Port:5432

Postgresql default port no is 5432. 

Username: openpg

Username of postgresql is openpg

Password:openpgpwd

For security reasons, postgresql default set password as openpgpwd. If we want we can change the password. We can only open the database using password.