Adding users and groups/roles without SQL?

Hello<br /><br />Please how do you create users and groups/roles w/o SQL?<br /><br />I know how to create a user with
query-command,also I would probably find the proper command for roles quickly... But I am quite confused by the fact
thatthe "Groups" and "Users" items (in the server-subtree) don't provide "New group" or "New user" option in their
contextmenus. Is it possible to create these kind of objects without writing a query?<br /><br />I have pgAdmin 1.8.2
andI am connected to the server as a superuser.<br />Could this be dependant on what version of Postgres is on the
server?<br/><br />Best regards<br />  Jaroslav Z.<br /><br />(I guess this is rather silly question but I wasn't able
tofind the answer in the archive; mostly I find threads related to sql-commands like "CREATE ROLE" etc.)<br />