My keyboard is typing letters instead of numbers [Closed]

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Registration date
Thursday March 24, 2016
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March 24, 2016
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My first question and I'd appreciate help please.

Trying to enter my new card number, after 4 numbers the keyboard types letters instead. This has happened on 3 sites now. I use the numbers above the letters on the keyboard.

I have a Dell desktop with Windows 8.1, does anyone know where I can get a diagram explaining function keys please?