You can modify a job at a later time, by selecting it in the job view and then right-clicking and selecting Edit. The O&O Defrag job dialogue will appear with the options for that job. Make the changes and confirm your entries with OK.
If you are using an already existing job and want to edit it, you may duplicate it. Select the job from the job list, right-click it and select Duplicate job.
You can select the job with a double click, and then edit and save it in the corresponding job dialogue.
To delete a job, select it in the job list, right-click on it and select Delete job. The job will then be deleted. The execution of the job is cancelled immediately.