To use a nebulizer mask, you first assemble the device by attaching the tubing from the air compressor to the medicine cup and then to the mask. You then add the prescribed medication to the cup and position the mask over your nose and mouth, turning the machine on. Breathe normally through the mask, taking slow, deep breaths, until the mist stops, indicating the treatment is complete. After each use, clean the parts and allow them to air dry completely before storing them in a clean, dust-free place.