By default WP Job Manager does not have categories enabled. To enable categories simply visit “Job Listings > Settings” and check “Enable categories for listings”
Adding a Category
If you have not imported the demo content you will need to add your own Job Categories. To do this, simply visit your WordPress dashboard. Then on the left hand side find the “Job Listings” menu item and click “Job Categories”.
Add and remove types like a standard WordPress category or tag.