Unscrew the four screws holding it in place with the same PH1 Phillips-Head screwdriver. They are numbered on the fan, 1,2,3,4.

The four screws are 12mm long, they also have a spring surrounding them.

Then carefully pull the cord connecting the fan to the notebook.

Insert your replacement fan, plug in its cord, screw it into place, and reattach the protective cover.