[berrypie]

For me I am using a software that allows me to type Japanese, but I don't recommend it as it sometime crashes my computer. (Then why do I still use it? 'coz I am too used to it now....)

If you are using Windows OS, in Control Panel there should be a option named "Regional and Languange Options", click it and a window pops.

Under the tab "Languages", you can click "Details" under Text services and input languages, where you can choose other input languages in here.