Lava Survival?

[Scabbesr]

I need to port forward. I already have another server, so the port 25565 is already used up.
I go to add it again, and it won't let me because it can't have the exact same value.
Then I go to change it to 25566 and it says "Port Overlap Occurred."

What am I doing wrong?

[dzienny]

Set MCDzienny to, for example, port 25564 and then port forward this port. If you don't know how to port forward read a guide written by HelloWorldCool. Just make sure that you don't run more than one server on the same port number.