Using pgAdmin to connect to a RDS for PostgreSQL DB instance
You can use the open-source tool pgAdmin to connect to your RDS for PostgreSQL DB instance.
            You can download and install pgAdmin from http://www.pgadmin.org/
To connect to your RDS for PostgreSQL DB instance using pgAdmin
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Launch the pgAdmin application on your client computer.
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On the Dashboard tab, choose Add New Server.
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In the Create - Server dialog box, type a name on the General tab to identify the server in pgAdmin.
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On the Connection tab, type the following information from your DB instance:
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For Host, type the endpoint, for example
mypostgresql.c6c8dntfzzhgv0.us-east-2.rds.amazonaws.com. - 
                        
For Port, type the assigned port.
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For Username, type the user name that you entered when you created the DB instance (if you changed the 'master username' from the default,
postgres). - 
                        
For Password, type the password that you entered when you created the DB instance.
 
                     
                     
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Choose Save.
If you have any problems connecting, see Troubleshooting connections to your RDS for PostgreSQL instance.
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To access a database in the pgAdmin browser, expand Servers, the DB instance, and Databases. Choose the DB instance's database name.
                     
                     
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To open a panel where you can enter SQL commands, choose Tools, Query Tool.