Assuming your toilet is spilling over and you can't seem to change the position of the valve, the next step is to check inside the toilet tank. Take off the lid covering the top of the toilet, then examine the upper arm. If the upper arm is open, work on it and close it physically. This should end the incessant flow of water.
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If the plunger does not get rid of the clog in the toilet, the next best suggestion is to get in contact with an urgent plumbing service like Mr. Rooter.