To seat the card in that slot, you’ll need to remove one, two, or, in some cases, three rectangular backplates from your case.
To seat the card in that slot, you’ll need to remove one, two, or, in some cases, three rectangular backplates from your case. It’s one of many thin metal brackets lined down the back of the case to keep it sealed up. Do this by removing the screw(s) that secures the backplate(s) to the chassis. Once removed, the plate should slide (or fall) out freely.