Step 1: Acquire Phillips screwdriver tool
Step 2: Insert screwdriver into one of the four screws holding the driver to the cabinet..
Step 3: Turn handle of tool in a counterclockwise direction until screw comes out. Repeat this step for the remaining 3 screws.
Step 4: Pull off wire connectors which are attached to the driver.
Step 5: Repeat process in reverse for new driver with the exception of turning the screws in a clockwise direction rather than counterclockwise. A helpful phrase is "Righty Tighty Lefty Loosey"

Best of luck!