Align the new unit with the RAM slot, and insert the RAM stick at a slight angle, it will rest loosely in its seat.

Lightly press down on the RAM until you hear a "snap". This means that the latches have clasped shut, securing the RAM stick.

Replace the memory door and secure the screw. Tightening the screw, but be careful not to apply to much torque, "stripping" the screw, rendering it useless.