If you don't have a popcorn maker, put enough melted (but not hot) coconut oil to lie the bottom of a saucepan and then put the popcorn in. Make sure the saucepan is large enough so the popcorn isn't piled up on itself.
Put your toppings in as well.
Put the lid on (so you don't get super hot missiles of popcorn) and put the heat on and let it go. Give it a shake every now and again so it is still coating everything.
Obviously this method uses a bit more oil, but it still rocks. Don't sweat a couple of unpopped kernels.