1.\ Hold the button on the key fob until the emergency key comes out.2.\ Ensure you have a firm grip on the fob. If you prefer, alternatively you can attach it to a sort of key ring that you can hold on your index finger.3.\ Find the seam that connects the lid and the base of your key fob. Use your fingers to begin detaching both. The small screwdriver can be used to seperate the pieces from one another. Be very cautious while doing this to avoid scratching the key fob.4.\ Replace the old battery. Ensure that the positive side faces inward/downward of the key.5.\ Close the remote in a tight manner to hold everything in place. The key fob battery replacement now complete!