Open the file manager on your device and go to the "Downloads" folder, where you will find the downloaded file.
After downloading the APK file, open it and your device will prompt you to install the app. Tap "Install".
After installing the app, an icon will appear on the screen. Tap and hold the icon, then drag it to the home screen for easy access.
The device must have Android 5.0 or higher and at least 100 MB of free disk space.
Check if installations from unknown sources are allowed and make sure your device meets the minimum system requirements.