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The panel is pryed off with a straight taper, and the remaining two screws can be removed with a cross cone.
You mean controlling two things with one switch? No problem. However, when the rear light and heater are turned on, they both work at the same time and cannot be controlled separately.
The round edge can be cut off, insert a sharp thing between the round aluminum ring and the aluminum gusset, pry the gap wide, grab the circle with your hand and pull it down, pay attention to both sides to force at the same time
To route with thicker wires, plug them into the socket.
The main thing is that the circuit is in poor contact, and it is important to check the switch.
It's that the dome light in the kitchen and bathroom is screwed, or there is one in it. Spring.