Use a computer with good quality speakers, or tablet / smartphone with earbuds. N.O.W.’s New Origin Waveforms are most effective when heard via two audio channels. Click “Experience stress and anxiety relief with N.O.W.”
Just listen for the full 3 minute duration. Bring your attention back to listening when your mind wanders. Then follow the gradual fade of the tones all the way into the ambient sounds around you. Sit in that ambience for as long as it is comfortable for you to do so. Notice the peaceful stillness that is available to you.