postgres

[rnewton3]

Hallo all,
     I've just installed the postgres stuff ok, but I thought I'd check out
a thought before I upset something.
I understand that user 'postgres' is the dba for postgres. It is user
postgres who adds and deletes users and
databases. Is it safe to change the password for user postgres? At the
moment I can only access the user by su'ing from root, is this the accepted
way of doing it?
Suggestions please.
I'd appreciate a cc as well 'cos I'm not at home at the moment. Thanks