When im playing worms 4 mayhem, i get sometimes a bit bored off playing against monsters. So i wanna fight real players. But when i try to go on network play, there comes a message who says: Your code version is up to date. And when i try to play its not working. All i can do is to chat with peoples.

My question is: how do you play online.

"Your code version is up to date" means you're running the latest version.

Can you elaborate on what you mean by "when i try to play"? Are you trying to join/host any games? We'd also benefit from knowing your computer details - which version of Windows do you have, what hardware do you have, which version of W4M are you running, etc.

Did you updated the game?
Worms Mayhem have service patch for online play.

Have you configured your router and firewall correctly? :)