Turn laptop around. On the back side remove the 3 silver screws shown as green circles in the figure.

Then take out the HDD (low right of picture) by pulling it up from the right side (connector area) and then sliding laterally to release the anchors in the left.

Remove the WIFI PCB (red box in figure). It has 2 long silver screws on the top.

Finally take out all the 14 black screws shown as red circles.