If you want to use the keyboard of your device:
1. Go to the "More" tab.
2. Tap on the "Settings" menu option.
3. Tap on the "Course Settings" option.
4. Tap on the "System Keyboard" switch button.
Note: If you enable this feature, the app keyboard will be replaced with the keyboard of your device, except for the Chinese, Japanese and Korean courses. This will affect only the games where you have to write.