How can I unlock Fn??

[seyha chhorn]

all way I can use on key Fn + F2 it turn on Wifi, but now I can not don't it. only press F2 is ture on Wifi and turn off wifi.

 

[Ravi Gagan]

This is because the digital lock is activated.*.To solve this, pressFn+Numlkor, depending on the model,Fn+Shift+Numlk