1. Click -> Reports -> Reports.
2. Open the report that you would like to edit.
3. Once the report is opened, click the button from the toolbar at the bottom of the window.
4. Click the Template tab at the top of the window.
5. Hover over the part of the template that you would like to edit and click the icon. This can be tricky as the labels are small, See the image below on how to do this.
6. Perform the required changes in the settings box and click .