The design option is used to change the lay-out of a report.
Select Define Reports from the Setup » Reports menu.
Select the report group in which the report you would like to change is located and choose [OK].
Select the report you would like to change and choose [Design], the report designer opens the report layout.
Add fields, variables, text, images etc.
Choose File » Save and File » Close after you finished designing the report lay-out.
It is not possible to use this option for system reports.