Can't use F5 and F6 keys to adjust brightness of LCD screen

I just bought a new Macbook (first one ever, new to Mac). I can't adjust the brightness of the LCD screen with the Function keys. When I do it, the icon pops up in the middle of the screen showing that it is being adjusted, but it does not change the brightness of the screen. I have turned off the auto adjust based on ambient lighting feature, and still not working right. I can adjust it by going into system prefs, but I would like to be able to adjust it using the function keys... Can anyone help with this? Thanks!

I am an idiot... i was adjusting the brightness on the keyboard backlighting, not the lcd screen.... woops!

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