Snap buttons have fallen off my parka. How

I have had a Down With It Parka for about a year. It has side vents with snap buttons at the bottom. On both sides, a button has fallen/ripped out, leaving a small hole that is leaking feathers. I have the button in one case, but not the other. Is there a way for me to repair this? I know how to sew on normal buttons, but not snaps. (Also, I don’t know if you have to do something special with this fabric. Also, I’m missing a button.