First, take a new battery out of the package and remove the sticker. Your batteries are air-activated so it’s important to not remove the sticker until you are ready to use it. Once the sticker is removed let the battery sit for a minute to fully activate before using that way you will get the most life out of your battery.
Next, open the battery door to remove the old battery. I suggest opening the battery door over the table just in case it falls out.