Uh, did you search for the thread?
And you can't get FM radio if you don't have the hardware. (It's not sitting in there waiting to be activated. You either have it or you don't.) I think it is only on the International but I'm not 100% sure which variants have it.
Please use search
before posting your question.
Be kind to the devs! Without them, XDA is just a bunch of jerks bickering.