windows, cant find ostgresql.conf

I just did a windows install of postgresql.  I cannot find or edit the postgresql.conf.  This is a new Dell machine running XP Professional OS.

 

I chose not to install as a windows service, but as a job which I can start and stop.

 

Where should I look for help.

 

Is it easy to uninstall?

 

Should I uninstall and then reinstall as a windows service?

 

If I install as a windows service, is that reversable, or might it permanently change my computer in some undesirable fashion.