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Herein, how do you open the valve on a propane tank?
Twist the valve in the direction of the "Open" arrow. Generally, propane tank valves are turned on when they are twisted counterclockwise. Continue to twist until the valve stops moving.
Furthermore, why is my propane tank hissing?
If the hissing noise is coming from the tank itself you should check the bleeder and relief valves. If the bleeder valve was left open the last time the tank was filled, simply closing it should shut off the hissing. Pressure usually builds up inside a propane tank on hot days.
Signs of possible problems with a propane gas regulator or appliance include lazy yellow or orange flames; a popping noise when turning a gas burner off or on; flames floating above burner ports; roaring noises from burners; flames at the burner air intake; flames spilling out of the burner; and heavy deposits of soot