Open Android Studio. Use File > Open in the menu to open the project. Select the LabAttendanceSystem folder in this repo as the root of the project.
Open device manager in manu View > Tool Windows > Device Manager if it is hidden. Create a virtual device or connect a physical Android device to the computer with device manager.
Build and run the app using Run > Run 'app', then the app will be installed and launched on the selected device.
You can also create APK using Build > Build Bundle(s) / APK(s) > Build APK(s) or Build > Generate Signed Bundle / APK, and then install the app on Android device using the generated APK.