All of your active scheduled reports appear in the listing on the Schedules page, which you can get to by clicking the Home drop-down menu, then the Schedules link, in the upper-left corner of the PUC page.
My Schedules lists the reports scheduled to run, the recurrence pattern for the schedule, when it was last run, when it is set to run again, and the current state of the schedule. You can edit and maintain each of your schedules by using the controls above the schedules list, on the right end of the toolbar. See the Pentaho Business Analytics document for details.