Hello, welcome to the forum.
There's no need to set any external IP in the configuration anywhere. Cuberite listens on all interfaces, so if you set up port-forwarding properly, you can access the server remotely without any problems and without any need for configuration.
Perhaps if you describe exactly what you are trying to achieve, and what steps you've taken so far, we could help you further.
Also, this is a site where we frown on bad language, so please watch what you type.
There's no need to set any external IP in the configuration anywhere. Cuberite listens on all interfaces, so if you set up port-forwarding properly, you can access the server remotely without any problems and without any need for configuration.
Perhaps if you describe exactly what you are trying to achieve, and what steps you've taken so far, we could help you further.
Also, this is a site where we frown on bad language, so please watch what you type.