The lens fell off my camera!!?

Every time I press this button on my camera the lens falls off. I only got it a couple weeks on boxing day week, but it's still was a expensive camera. It's the Nikon D800 or 900 or something. I'm really worried my camera is broken now cause I can never get the lens to stay on. Is this covered under... show more Every time I press this button on my camera the lens falls off. I only got it a couple weeks on boxing day week, but it's still was a expensive camera. It's the Nikon D800 or 900 or something. I'm really worried my camera is broken now cause I can never get the lens to stay on. Is this covered under warranty? I am really frustrated. Can anyone help me?? Also where can I get my memory card out I forgot where I put it in?
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