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how open back panel of ACE EXTENSA 5620z?

 how to open back panel of ACER EXTENSA 5620z

 you will need clean small + headed screwdriver (in sizeing if I remember correctly it is the one sized 0), 
A small pot or cup (to put screws in, there is 7 in all)
A clean towel (to lay your laptop on so as not to scratch it)
A spare couple of minute's (to complete the job)
A wife/Girlfriend (to shout at when you loose one of the screws lol)

MAKE SURE LAPTOP IS POWERED "OFF"
WEAR AN ANTI-STATIC BAND,  

1. Flip laptop over so it is face down.
2. Remove the battery (slide the 2 release sliders)
3. Unscrew all 7 screws 1 at a time and place removed screws in pot/cup
4. Carefully pry off the back-cover that now has no screws in, being careful not to damage any of the pins around the side's. 
5.  Go and apologise to your other half for all the abuse you have just verbally given her & explain that's your method of concentration lol

Try a screwdriver.