The reports under Report Library (canned reports) are not editable and cannot be scheduled to run. The report fields, parameters, layout, etc cannot be edited nor can any entries for the parameters be saved as default.
This is by design to ensure the canned reports will never be changed. To edit any of the canned reports. you need to first copy it to the My Reports folder. Once you open the report in the My Reports folder, the report is fully editable and all parameters can be saved as default to make running the report multiple times easier. Once the parameters have been saved the report can then also be scheduled if desired.