Using the Mag Striker with Tinder Cord is a breeze. First, take out the tinder cord and place it where you want to start the fire. Then, hold the magnesium rod firmly by its handle. You can wear gloves if it's cold. Strike the ferrocerium flint on the rod against a hard surface to create a shower of sparks that will land on the tinder cord and ignite it. Once the tinder cord is lit, you can use it to start your fire or light your stove. As for maintenance, keep the tool dry when not in use to prevent rusting. If it gets wet, dry it thoroughly. Also, make sure to store it in a safe place. Be careful when using the bottle opener part, as it's made of hardened steel and can cause injury if not handled properly. Enjoy your reliable fire - starting tool in all your outdoor adventures!