This should go after the [config] line in your pickit.ini file.
LogEnabled=1
Logfile=pickitlog.txt
LogPath=C:\Program Files\JED\
Unless you have JED installed somewhere other than the default, then enter that.
Oh yes...and make sure at the end of your item you have Log=1
[item description]
code="xxx"
type="xxx"
pickup="xxx"
Log=1
Just like that...it'll log whatever items have that under them.
Hope that helps.