How do I use the Trac Gantt Plugin?

http://recurser.com/articles/2008/11/26/gantt-calendar-plugin-for-trac/ has detailed instructions. For your convenience, we've reproduced them here.

1. Enable the plugin using the Admin panel in Trac.
2. Add the following settings to your custom fields:

   complete = select
   complete.label = % Complete
   complete.options = 0|5|10|15|20|25|30|35|40|45|50|55|60|65|70|75|80|85|90|95|100
   complete.order = 3
   due_assign = text
   due_assign.label = Start (YYYY/MM/DD)
   due_assign.order = 1
   due_close = text
   due_close.label = End (YYYY/MM/DD)
   due_close.order = 2

You can use the inteface in ProjectLocker Portal to add these fields.