I can't set the display settings of my monitor?

I use a LG 17 inch CRT monitor. It have an option to lock the display setting controls by pressing menu + right for 3 secs....
Its given to press duplicate combination to unlock the controls.But now when i do this i'm not competent to unlock the controls....is there any wa out lacking opening the monitor.....

Answer:
Check the user's encyclopaedia that came near it. If you do not have one, try a Google on LG products, later see if the manual is online. Usually is a pdf report if online.

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