How to remove FN key for Minecraft?

Hi, I recentl got my new Toshiba laptop. It runs Minecraft GREAT BUT To press F3 or F11 or F5 I have to press FN I can't have that button anymore, How do I remove it?

Master 06.05.2015

1 Restart the computer.
When the logo appears, immediately press Fn+F2 to enter the BIOS setup utility.

2 In the BIOS setup utility, open the Configuration menu, and change the setting of HotKey Switch from Hotkey Mode to Legacy Mode.

3 Open the Exit menu, and select Exit Saving Changes.

Note: When hotkey mode is disabled, press the Fn key and the appropriate hotkey to access the corresponding hotkey function.

Youssef 06.05.2015