There are various reasons that you may need to reactivate a Job: rework, accidental completion, etc. Regardless of the reason, reactivating the Job is a fairly simple process.
Open the Job Record
Navigate to the 'Schedule' tab > Click 'Edit' > Click on the 'Status' field
Click 'Activate This Job Now'
Click 'Save'
Your Job will now be Active
Please note, completed jobs will be removed from the Jobs Widget seven calendar days after the job was completed or cancelled. You can locate such jobs through Finds. For more information on how to locate jobs through Finds, please see Locating Information through Finds