How to turn on wireless capability on lenovo Thinkpad Edge E320 (1298)?

I have problem in turning on the wireless capability on lenovo Thinkpad Edge E320 (1298). I tried in many ways but I can't turn it on. I tried with troubleshooter, it says to try to turn on with side switcher or function keys on my keyboard. It doesn't have side switcher for wireless, it can be turned on/off only with keyboard (Key F8), but it doesn't function. Please help me as fast as it's possible.
Best regards