HOW DO I TURN OFF CAPSLOCK?

I ACCIDENTALLY TURNED IT ON AND NOW I DONT KNOW HOW TO TURN IT OFF, I WRITE EMAILS TO MY FRIENDS AND THEY THINK I AM SHOUTING AT THEM, MY GF HAS STOPPED TALKING WITH ME IN SCHOOL SINCE I WROTE HER IN CAPSLOCK IN FACEBOOK, MY FAMILY FRIENDS HAVE CALLED MY FATHER INQUIRING WHAT HAS HAPPENED TO ME BUT I CANNOT MAKE THEM UNDERSTAND THE PROBLEM WHICH I AM FACING. THIS PROBLEM HAS RUINED MY LIFE