BUG #2854: can't log out database system

["Jessica" <hxq7681(at)rit(dot)edu>]

The following bug has been logged online:

Bug reference:      2854
Logged by:          Jessica
Email address:      hxq7681(at)rit(dot)edu
PostgreSQL version: 8.2
Operating system:   Solaris
Description:        can't log out database system
Details: 

I log into database system, but I don't know how to log out and back to my
account prompt. 

I use psql -test, nothing occurs and I can't be back to my account prompt
again. 

What does it mean such a message as below:
FATAL:  syntax error in file
"/home/group/s772/p772-01f/pgsql/CLUST/data/postgresql.conf" line 101, near
token "MB"

Where can I find a really instruction to how to use postgresql for people
who are not experts?   

Thanks.