You can modify sources in the Repositories pane, under the App Builder tab, select the source that you want to modify. Its properties are displayed in the Properties pane.
You can modify the Label, Route, data source and Workflow options.
CAUTION:
The route is used to accessed the application and its functions. Renaming it will break any links that reference it. Do it only when necessary.
You can change the source System Name by right-clicking it in the Repositories pane and selecting Rename. The System Name must be unique within the application.