The F-XX keys, like F1, F2?
IIRC, most laptops with FN keys that have 2 labels defining another function have an FN key you need to press, try holding the FN key down and press the F-XX key you want, like so:
FN + F2, FN+F8, etc
Atleast, this is how it works for me, not sure if your keyboard works the same