pgaudit log directory

Hello,
I'm using PostgreSQL 10.5 on Linux (RHEL). I'm new to administering
PostgreSQL and recently installed pgaudit. I believe I have it installed
correctly and wanted to start playing with it to see how exactly it works.

So while walking through a tutorial I found online, I saw where I can enter
a statement in PostgreSQL, such as:
ALTER SYSTEM SET pgaudit.log TO 'read, write';
SELECT pg_reload_conf();
Then after reading or writing to a table, you can then check "pg_log" for
the audit entries. But my issue is that I can't find the log file at all?

In my main PostgreSQL directory (/work/PostgreSQL/10)I do have a file
called "logfile", but there are no entries from today. When I go into the
pgaudit sub-directory (/work/PostegreSQL/10/pgaudit) I don't see any log
file in there either?

Can someone point me in the right direction?

Thanks,
Dave Hughes