how do you adjust he brightness even of the monitor peak?

Answer:

Most monitors own 4 buttons on the front. They will be labeled:

EXIT, -, +, and menu. (Some may have icon instead of text). Choose Menu and select brightness then use the plus or minus button to set brightness. Exit when done.
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usually on the front of the monitor or the display properties
theres a knob somewhere on the monitor or buttons on it besides a power button, on older monitors they may be down a small plastic hinge door
On the front side, you'll find a button of 'menu'. Use it to adjust all such things approaching brightness, contrast,etc.