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I haben't used this keyboard, in fact I've never used a DVORAK keyboard but try to change the settings...Menu> Settings> Language & input> Keyboard & input method...Here next to the DVORAK keyboard you'll see three sliders, this is the settings so select this and you should be able to find the settings to change the keyboard.As for the security warning, you'll get this for any 3rd party keyboard because in theory the keyboard can learn what you type including usernames and passwords.
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