You can't install any language by yourself. So you must take it to nearest Nokia care point. But i'm not sure US care centers can install those languages. Better if you can contact them.
09-11-2010 8:54 - edited 09-11-2010 8:55
Alternately, you could try Psiloc Crystal Japanese and Psiloc Crystal Chinese (http://shop.psiloc.com/en/). It's not a free app, but it works wonderful. At least for Japanese since I have it on my phone. And the Japanese Reader is free.
Nokia didn't install language pack. sure no Japanese from nokia-
read my post
You can install font very easily
just install Font Type A or B in 30 seconds you can read japanese
or install free crystall japanese reader
But I prefer Jplus font
Or old Nokia Font (it's said in MFEP60 site, but I don't know where they are)