How do you take the back cover off the samsung gravity?

Ok so I have a samsung gravity and i wanna take the back cover off how do u take it off because i am having difficulties with it?|||When i had that phone i could never get the back off it. My mom always did it for me lol. Apparently theres arrows on the top and bottom and your supposed to push up.|||LOL i had tht same prob wen i just got my cell lol and wat happend is i actually read the manual and it said to press the centr and push it left from the camera lens.