@glow1981: if you just mean you have the japanese keyboard for messaging, it's simple to change it back to English. Go to write a text message and tap where it says 'Type to compose'. When the Japanese keyboard appears, touch and hold the text that says 'Type to compose' or the '?123' button. A screen will pop up including the option 'Input method'. Tap that and select 'Standard keyboard' or 'Android keyboard', both of which are English. I prefer the Android keyboard, but see which you prefer...
If you mean the whole thing has turned Japanese, let me know and I'll let you know what you need to do, but in brief, press the menu key, then settings (bottom right of the touch screen buttons), then the 4th from bottom on the next screen, and then the top option from the next screen, which is where you set the locale and languauge settings for the phone generally. From that, select whichever version of English you want - English or American.
I do hope that this makes some sort of sense, and that it helps!
