Starship Server is now up an running. If you open a browser on the machine where it is installed and go to (port might differ)
<http://localhost:8080>
you should see the server's login screen.
Now make sure that it is visible to other machines. On some other device, open a browser and try to go to the server. You will probably have to write an IP of the server's machine
http://<some ip>:8080
If this does not work, then Starship client also won't work. Usually the problem is firewall or router. If you have a firewall, make sure that it allows connections to the server. Same thing if you have a router. You need to allow incoming connections (port forwarding) to the server.
Before you try to connect in Starship, always first try to make the connection from a browser.