If you wish to completely delete a job:
Navigate to the Job
Open the black Gear icon
Select "Delete Job"
If you don't wish to delete a job but simply make in inactive so that you can always go back to the record and view candidates that you previously sourced for that role follow the below steps:
1. To make a job "inactive," click on the gear icon, then Edit within the job.
2. In the top center of your job folder, click the drop down that says "Active" and select "Inactive."
3. Click Save.