There's a few different ways to set up port forwarding, and instructions you'll need specific to your router can be found here. Once you've set it up, give your friends your IP address, and they'll be able to join.
There's a few different ways to set up port forwarding, and instructions you'll need specific to your router can be found here. Once you've set it up, give your friends your IP address, and they'll be able to join.