You can edit a job by clicking on the green edit button 
in the Actions column for that job. This will bring you to the Edit Job form. Here you can modify a jobs details. This will have the same fields as the Add Job form. Go to the Adding Jobs section of the manual to learn more about the form.
*If you do not see the green Edit button, it is because the screen is too small and you will need to expand that entry by first clicking on the green plus icon 
immediately to the left of the entry.