Missing f10,11,12 keys?


So I am using Sharpkeys to ix my keyboard cause all of a sudden, this morning none of my hotketys were working (volume up, volume down, music play, screen brightness things). So I went to go fix my volume up key and I used the type key to find f10 since that's the button its hotkeyed to originally. So I did that, and when I pressed the f10 key nothing would come up, like the key didn't exist. I scrolled through to try to find it. It wasn't in the list. WHAT DO I DO? I need the volume up key (f10) to work!