Arma 3 Multiplayer?

Hey I have been trying to figure out how to play coop with my friend but when I launch a game he cant find me in the servers list and I also cant figu

Hey I have been trying to figure out how to play coop with my friend but when I launch a game he can't find me in the servers list and I also can't figure out how to invite him. Is there a way to play together other then paying for a server? Or is this just a screwed up feature?

or:Hey I have been trying to figure out how to play coop with my friend but when I launch a game he can't find me in the servers list and I also can't figure out how to invite him. Is there a way to play together other then paying for a server? Or is this just a screwed up feature?

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