In Moodle 2.0 the Journal was removed from the core install, and is now available only as a plugin. For the history, please see this discussion: https://moodle.org/mod/forum/discuss.php?d=96334
The purpose of the Journal
What makes it different from an Online Assignment? How could you use it?
Using the Journal
In the shift from 1.9 to 2.x the help files seemed to get lost. I could not find any really current material, but there are some screenshots here: https://moodle.org/mod/forum/discuss.php?d=257145 (from AL). If you do do a little fixing up of the docs, delete this message. --Derek Chirnside (talk) 03:52, 28 March 2014 (WST)