Step One: Position your computer close to the audio source

1. Be sure to plug your computer power supply in
2. Boot up your computer
3. Launch Audacity

Step Two: Connect the ground loop isolator

1. Connect the male connector into the computer's mic input
2. Connect the other end into your audio source

Step Three: Test IT!

1. In Audacity, click the red record button
2. I suggest you use head phones and plug them into the head phones jack of the computer and listen to your audio source.