Adjusting monitor brightness....?

Does anyone know how to adjust the brightness on my hp laptop ? It's too bright and it's making me tired!

Answer:
here should be a function key(usualy blue) and looks like fctn
hold that down and look for a another blue switch that looks like a sun or plain star-click that at the same time-they are usualy together and usaly lying on one another-click it till u get the desired effect
right luck

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