Please use wired headphones, set your device volume to maximum and find a quiet place. We will first calibrate the test tone so that you can just barely hear it, then play a series of tones at different frequencies. For each tone, click "Just heard" when it becomes audible or "Louder" if you need the level increased.
Play the reference tone and adjust the slider until you can just barely hear the sound. This sets your baseline for the screening.