Remove the two 3.0 mm Torx screws from the front. Use a T4 Torx screwdriver to remove the screws.
The two 3.0 mm Torx screws are painted blue at the end. These screws have screw holders around them that will also need to be removed.
Unscrew the screws from the front of the watch casing and the screw holders fall out from the back of the watch casing.