You can edit a reports details by clicking on the green edit button 
in the Actions column for that report. This will bring you to the Edit Report form. Here you can modify any report information. This will have the same fields as the Add Report form. Go to the Adding Reports 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.