How can I edit the Job traveler?

The Job traveler is not an editable form.  It is, though, customizable to an extent.  To customize the traveler, go to (Jobs > Jobs) and click the 'Traveler' button.  Use the filter screen that pops up (prior to the report actually displaying) to customize as desired.  You can save your customized layout and even set it as the default on this same filtering screen.