Login to the system and select EPM from the product navigator.
Go to Reports. You will be able to view a list of in built reports made available to you. The custom Reports will show Custom Report highlighted next to the title of the report. Select the custom report you would like to edit by clicking on the (3 dot) icon and choose Edit.
A form with the report details will open and you can make the required changes.
Click on the Finish button.