Uninstalling the Hello World App is typically a straightforward process, and it largely depends on the type of device you are using. For most smartphones, whether they are running on iOS or Android, you can usually uninstall the application by navigating to your app drawer or home screen. On Android devices, you can press and hold the app icon until a menu appears, which usually includes an option to uninstall. You can then confirm your choice to remove the app.
For iOS devices, you can press and hold the app icon until it begins to wiggle, and then tap the small 'X' that appears on the app's icon to delete it. If you are using a computer, you may find the application in your list of installed programs or applications, where you can select the Hello World App and choose to uninstall it.
It is always a good idea to consult the official web page for further guidance specific to your device and any additional information regarding the uninstallation process.