I am unable to find a reference for this machine. Please check the model number.
General information – if the machine is built on a white plastic tray, the valve is accessed by a lift-the-tongue-and-slide panel on the back of the tray. The older “open” machines have the valve mounted at the front centre, on a bracket.
……..or for this one assuming S5443X1GB, it will have an aquastop unit (square block thing that screws to cold water coupling of your plumbing) under sink maybe 😕