omg...I cant believe you guys cant answer this....

on the top left just below the "file, edit..." and all of that shit there should be a rectangular box that shows a picture of soundwaves in it...all you gotta do...(listen carefully) is:
1. put your hand on the mouse
2. move the mouse
3. direct the mouse's arrow to the box
4. lift your finger
5. press down on the left mouse button
6. cum all over yourself from the excitement of learning such a simple task

I learned it off of a mr. rogers episode

-PEACE