HOW DO I TURN OFF CAPS LOCK?

I ACCIDENTALLY TURNED IT ON YESTERDAY AND I DON'T KNOW HOW TO TURN IT BACK OFF. ALL MY FRIENDS ARE MAD BECAUSE THEY THINK I AM SHOUTING AT THEM OVER THE INTERNET. THIS PROBLEM IS LITERALLY RUINING MY LIFE AND TEARING MY FAMILY APART. I JUST WANT TO BE WHOLE AGAIN. PLEASE HELP!! <Yahoo! Answers>