How do you start a co-op game online on resident evil 5?

I am having trouble figuring out how to start a game, I would like to play with my friends.How do you start a co-op game online on resident evil 5?Change the game settings to allow anyone to joinHow do you start a co-op game online on resident evil 5?on your game when u load it up it brings up that one screen that no one bothers looking at lol but on that screen u can change it to co-op privite or pub.. i never notice it till i was on chapter 5