Please use the proper screw driver to avoid damaging the screws. Begin each screw by hand carefully to avoid cross-threading.
The orange circles identify the mounting points for the guard.
The red rectangle indicates the spring loaded lever that is used to remove the seat. To install the seat, gently push down until it clicks into place, you can slide the lever over for easier install. To remove the seat, the lever must be slide over and the seat should not be forced off but come up easily.