Look at the back of the case. There is a hand grip next to the chassis fan. There is a screw on that side panel by the hand grip. Remove that screw, and pull back on the hand grip.
The hand grip is just above the screw in this picture. Removing the side panel is best done with the case on it's side. Pull the side panel back about an inch and you should be able to lift it off at that point.
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