How do you unstick afloat value on a toilet tank?

To unstick a float valve in a toilet tank, first turn off the water supply to the toilet. Remove the tank lid and gently lift the float arm to see if it moves freely; if not, you may need to clean or adjust it. Check for any debris or mineral buildup around the valve and clean it if necessary. Once everything is clear, turn the water supply back on and test the flush to ensure proper function.