You can easily resume, pause or cancel a schedule by clicking on the status of the direct debit.
Resume - Resume's the direct debit from the next due date
Pause - Will stop debiting, any debits that are missed while the schedule is paused will be marked as arrears and will NOT automatically be caught up. If you choose to resume the schedule you can either catch up or write off the arrears (read more about arrears management)
Cancel - Will permanently cancel the direct debit, you can not resume a schedule after it has been cancelled.