I have just bought a HP Photosmart Wireless B110a series printer and i need help with the language?

I have just bought a HP Photosmart Wireless B110a series printer and i choose Japanese as the language (not meaning to). I now cannot find anything and i need to change the language back because it's all in Japanese. How do you change the language (in Australian or Japanese). Please this is urgent. Respond ASAP! Thankyou very much