How to create users for a login Role?

​Dear All,

I know how to create a login role for a postgres database.
I used pgAdmin III to create login role and database.
or via psql command;
postgres=# CREATE ROLE dbuser PASSWORD 'secret' SUPERUSER CREATEDB
CREATEROLE INHERIT LOGIN;

I'd like to know how to create users/members for each login role.
How can I do it?
I'd like to allow multiple users to access to a database.

I used postgres installed Ubuntu Server and access by pgAdmin III and SSH
from Window OS.

​Many thanks & best regards​

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Have a nice day!
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*Mr. Khun San Aung*
* <http://geoportal.icimod.org/>*