Do you have "xev" installed on your system?
It sounds like you need to map your function key, but first you have to find out what the keycode for it is. The easiest way to do that (I know of) is xev. Open a terminal, type in xev, hit enter and you should see a little box and some mouse and keyboard data appear on the screen. Press your function key and it will output the keycode and keysym of that key in the terminal.
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