In this case, pressing and holding the Fn key while simultaneously pressing the desired function key will activate the secondary function. Some laptops have three functions and an Fn1 and Fn2 keys.

How to Fix the Fn Function on a Dell Computer. The "Fn" key on a Dell toggles the multimedia keys on and off. On some models, you must press "Fn" to activate these multimedia keys, but the ...

Function keys that enable convenient features like instant browser refreshing or screenshotting pages are lost unless you hold down the “fn” key on your keyboard.