To remove an ear cushion, twist it counterclockwise. Select the correct replacement for the left or right ear. These are marked with an L and an R on both the headset and the ear cushions themselves. Line up the long and short slots on the ear cushions with the matching ridges on the headset. Push down and twist clockwise, until it clicks into place. Go to the MyDyson app and recalibrate your headphones each time you replace the ear cushions. You can find out how to do this in the MyDyson app.