total newb, cant seem to trim or cut :(

I am trying to cut down a song for my sister to use in her talent show, and I cant seem to get it to trim or cut out parts or to do anything! I can select it but that seems to be it. I am using windows 8 and I just dont know what else to do. I keep clicking the trim and cut buttons and nothing is happening…

Ensure that playback is not paused. Most functions are disabled unless Audacity is stopped (not paused, playing or recording). Click the “Stop” button.