Pull the mask firmly to start the flow of oxygen. Oxygen will flow through the bag even if the bag is not inflight. Lace the mask over your nose and mouth and fit the elastic strap over your head. you need to wear your own mask before you help other. Please study the safety instruction card in the seat pocket, it provide detailed information on life jacket as well as the operation and location of the exits on this aircraft. The safety information card also shows the brace position if directed to adopt the brace position. Place both feet together on the floor with your feet just behind your knee and lean forward as far as possible. Cross your wrist and hold on top of the seat in front of you then rest your head on your arm. If there is no seat in front of you lean forward as far as possible and wrap your arm around your knee