Install the new SSD by gently doing the reverse and pushing it into the slot and then down. Make sure the screw holes line up!

If you've correctly installed it, your machine should resemble the picture with the Green rectangle; with no exposed copper and the screw holes should also line up.

If your copper contacts are still exposed, as in the picture with the Red "X", then you need only push the SSD gently deeper into place.

Now put the silver screw back in the hole. It should be screwed all the way down, but not too tight.