To launch an app on your Android mobile phone, you can follow these steps:
Unlock your phone and tap the home button to go to the home screen.
Locate the app icon on the home screen or in the app drawer (usually located at the bottom of the screen).
Tap the app icon to launch the app.
If you cannot find the app icon on the home screen or in the app drawer, you can try searching for the app using the search function on your phone. On most Android phones, you can access the search function by swiping down from the top of the screen.
Alternatively, you can launch an app from within another app by tapping a link or button that opens the app. For example, if you receive a notification from an app, you can tap the notification to launch the app.
Keep in mind that some apps may require certain permissions to be granted before they can be launched. If you encounter an error when trying to launch an app, you may need to check the app's permissions and grant any necessary permissions.