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facing radiator left valve ( might have rubber cap) is cut off valve which used to cut water supply off( off clock wise). the one on your right must have turn thermostatic handle where you control your temperature handle and this is the one you should be using it to control heat
it could be joist problem or just plywood needs to be attached better to the joists. also if your floor is wooden/laminate and was installed on uneven floor that could be an issue. i could definitely help you out, but i will need to see it first