new island phoenix

I lost a corner piece to my new isloand phoenix stickerless cube, and am wondering what I can do with the other pieced.

So I just got a stickerless new island phoenix today, and it came rather loose. (oh and I'm brand new at cubing and can't solve a cube yet) As I was scrambling it, I think I flipped one of the corners in a different rotation than it was. Does this matter? Can I fix it? How can I tell...