You can re-run an old/existing report from the tool page within your Admin Console. To do this you simply click on the Re-Run report button next to the report you want and then confirm that you definitely want to re-run that report. Re-running a report will use up 1 report credit. You can’t re-run a report if you don’t have any report credits available.
Please note you are not able to re-run a report for ReviewFlow or CitationBurst.