How to put translation feature in my blog??????

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Hi my fellow myloters I need help here. Recently I learn how to make a blog after reading help like crazy, I made it . You can check the result here http://tomatcherry.blogspot.com/. I will love to if you visit it and I am wiling to do the same for you, just tell me. The problem is I want to use translation feature on it, so many people with different language able to reads it too. Few month ago I see with this feature, its just a certain nation flag, just by clicking the flag its automatically change the language. Does any one know it. Thanks.