In order to have an overview of all scheduled reports and delete the ones that you no longer want, log in as Administrator and move to reports to open any scheduled report or create a new one in order to come to the modal view (1).
You will find a list of all scheduled reports (2) and information about their name (3) and type (4). You can also view this and then the next run will occur (5) while under the operations column you have the option to delete a scheduled report (6).
Please note that his action can not be undone (7).
Data can be exported in csv format (8).