How do I remove the VESA over for a Touchsmart 520-1070

Hello,
Recently I had encountered a problem with my wireless keyboard and I was to check on the wireless receiver but however I cannot seem to get the VESA cover open, any help would be appreciated.

Hi,
Hope the following document helps (!!!):
   http://h10032.www1.hp.com/ctg/Manual/c03357415.pdf
More manuals from the following link:
     http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&lc=en&product=5157120
Regards,
BH
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