If you accidentally schedule a report that you do not want to run, then simply follow these two steps to delete it. First, locate and select the report you wish to delete from the Schedules tab. Then, click the Unschedule button above the list of reports.
Once you click Unschedule, your report will remove from the list of reports.
Note: this will not effect any reports already previously run that are housed in your Reports list.
Please see the following links for more information about reports: