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Question: I am not able to find the @ sign in the keyboard.

first time I got it, then I press some bottoms and the letters came smaller and smaller. I rebooted and the normal size came back but I have not been able to find the arroba @ sign again...so I am unable to write my email address....This is a serious problem. I need HELP!! Pls. write to sguppy@fibertel.com.ar