You can change the delivery dates on your scheduled reports at any time.
Under Reports
  1. Scroll down to the Scheduled Reports section
  2. Click on Schedule ​
  3. Under Current Scheduled Dates, click on the date you wish to remove
  4. If more than one or all the dates should be deleted, use the control key to multi click on each date or drag your mouse down the list to highlight all dates
  5. Click Delete
  6. Click Save Changes 

You may go back into the scheduler and reschedule your report, if needed.