You can modify a report template from the List of Report
Templates.
Select Report > Report Templates to open the List of Report Templates
Note: You can open the List of Report Templates from
the List of Reports by clicking the Manage Report
Templates tool.
Select a template type to display the list of available templates of that type.
[optional] Click the Path tool to select
a different directory in which to search for templates.
Select a template and click the
Properties tool to open it in the Report
Editor.
Make any appropriate changes to the template and then click the
X at the top right of the Design view to close it and be prompted to save your
changes.