I hope you have installed pgadmin3 from my previous post .
Now open pgadmin 3.
Add a connection to server by clicking the first option in the top of the window.
Add the details as added in the below snap:
Name is the name of the database.
Host is our localhost which is setup at 127.0.0.1
Port can be left as 5432
Maintenance DB and username is by default postgres
Add the password you have given in the postgres setup in the password field.
Click OK and you are done with server connection.
Go to the database you have created and start exploring through SQL queries.
Thanks for reading.If you have any issues/doubts,feel free to comment or drop me a mail at firstname.lastname@example.org
Have a nice day.