Put the mouthpiece in your mouth (upside facing up), trim off excess material on the tip or wall until the mouthpiece doesn't hit the gingiva.
Heat some water to 90 - 100 Celcius degrees, put the mouthpiece in the water for 10 - 20 seconds by holding the black handle, do not remove the handle in this step.
Take the mouthpiece out from the water, leave it to cool down for 6 - 15 seconds, put it in your mouth and pressurize by biting on the tab in order to mold the shape.
After the shape is molded, remove the holder and side pins, repeat steps 1 - 4 if the shape is not satisfactory.
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