Adding or installing a keyboard in another language
If you need to type special characters in another language, it is recommended to install new keyboards in you computer/device. You can find simple instructions about how to download those keyboards here:
Also, you will be able to ask the course creator to add an onscreen keyboard. You will need to consider that this is only possible for some languages (e.g. Korean).
How to contact the course creator
Changing keyboards in the App
During tapping tests you can tap on the keyboard icon on the upper right side of your screen, in order to change your device's keyboard.