Post-installation questions

Hello:
 
This is a newbie question as I have not used the product before. After installation of PG 8.2 I noticed that I have 2 servers: postgresql database server 8.2 (localhost:5432) and another one differing only in the name (the second one is 8.3). The problem is that I did not request the 8.3 during installation. Based in the instructions I downloaded from the internet (admittedly the instructions applied to PG 8.0) I should have only had one server after the install. In addition, the PG 8.2 has a username of postgrestest (I did not do this during installation) and I cannot logon to the server because I do not know the password (I did not set one up).  Also the documentation I am reading provides instructions for setting up Users (it has a User node under the server in the documentation) but the PG 8.3 has what it calls "Login Roles(1)".
 
Again since I am new to the product I am not familiar with it. How can I set up users and is there documentation out there that accurately descibes the PG 8.3 version installation process? Is it usual that you get two servers on installation or did I do something wrong? Any help you can provide will be appreciated.  Thank you.
 
Bill Wayne

---

Pack up or back up–use SkyDrive to transfer files or keep extra copies. Learn how.