scroll lock + fn key

All Macs should have a fn key in the very bottom left corner. It is under the Shift key and next to the control key.

A: ur numlock key is active/on disable it or press function key +numlock key ----------------- i have a laptop and i somehow pressed some key and some of my keys are not working...but when i press the fn key..it works..so how do u unlock the fn ke

The Fn button is the function key. A key that works like a shift key to activate the second function on a dual-purpose key.

If you are using mac, and the f5 key does not work, it is because you are not holding down the fn key. The fn key should be on the bottom left side of your keyboard. Hold down the fn key while pressing f5 and it should work. Hope this helps!