Login problem

Hi...

First: I'm a complete newbie on sql-servers ;-)

I have installed pgsql on a OpenBSD, and also phpPgAdmin.

I had some trouble doing that, so I'm not 100% what I did, regarding 
to database names, users, passwords...

My problem is that i cannot get throught the login, I keep getting a 
login failed.
This happen from both phpPgAdmin and psql...

Is there anywhere I can see what databases that are created, and 
which users are created?
Is there anyway to see the users passwords, or to "reset" them ?

I have spent the whole day trying to get through, googling and 
man'ing, but to no use :(

Therefore I hope to hear from you ;-)

Best regards
Danjel Jungersen