Here, you will find players' requests to play with others! You can put up a thread to ask others if they want to play.
You don't have to share your IP publicly. You can find other ways to share it with others. To find your IP address to share with others: https://www.ipchicken.com/

Make sure you port forward your game when you play with others! Let others know if you use a port other than default 6511.
To join a server using a port other than default, use the following structure: ip.address.here:port
To port forward: http://lmgtfy.com/?q=how+to+port+forward

Do not disable your firewall or antivirus.