Farinaz, that link was for the DXi, and so in your case should work.
Kamran, serial number is displayed in small print on the back of your Kindle DX. It begins with something like B00....
Neither of the Kindles (or any Kindle for that matter) uses Wifi in the sense you're assuming, that is, through your personal wireless network.
From the sounds of it you have US DX; the wireless will only work in the US.
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